| Saba Island | Sorong | 0.09 km² | — | 13 m |
| Sabal Island | Tanimbar Islands | 5.09 km² | — | — |
| Saban Kecil Island | Raja Ampat | 0.00 km² | — | — |
| Sabari Island | Milne Bay Province | 4.04 km² | — | 55 m |
| Sabaro Natuk Island | Fakfak | 0.02 km² | — | — |
| Sabaro Nenem Island | Fakfak | 0.03 km² | — | — |
| Sabaro Selatan Island | Fakfak | 0.04 km² | — | — |
| Sabaro Tengah Island | Fakfak | 0.01 km² | — | — |
| Sabaro Utara Island | Fakfak | 0.01 km² | — | — |
| Saber Island | Aru Islands Regency | 0.00 km² | — | — |
| Sabir Island | Aru Islands Regency | 0.00 km² | — | 9 m |
| Sabiro Island | Aru Islands Regency | 0.00 km² | — | — |
| Sable Island (Papua New Guinea) | Autonomous Region of Bougainville | 0.03 km² | 0 | — |
| Sabuda Island | Fakfak | 6.56 km² | — | 51 m |
| Saddle Island | Queensland | — | — | 10 m |
| Saddleback Island | Queensland | — | — | 70 m |
| Safa Atsa Island | Raja Ampat | 0.00 km² | — | — |
| Safa Genan Island | Raja Ampat | 0.01 km² | — | — |
| Safa Genan Lol Island | Raja Ampat | 0.00 km² | — | — |
| Safa Island | Raja Ampat | 0.01 km² | — | — |
| Safa Lu Island | Raja Ampat | 0.00 km² | — | — |
| Safa Yeben Island | Raja Ampat | 0.00 km² | — | — |
| Safodik Girif Island | Fakfak | 0.00 km² | — | — |
| Saga Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Atsa Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Fat Island | Raja Ampat | 0.04 km² | — | — |
| Sagaf Fit Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Lafa Island | Raja Ampat | 0.04 km² | — | — |
| Sagaf Lafamaifat Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Lafamailim Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Lafamailu Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Lafamaisa Island | Raja Ampat | 0.01 km² | — | — |
| Sagaf Lafamaitol Island | Raja Ampat | 0.01 km² | — | — |
| Sagaf Lim Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Lu Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Si Island | Raja Ampat | 0.11 km² | — | — |
| Sagaf Tol Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Wal Island | Raja Ampat | 0.01 km² | — | — |
| Sagaf Wonom Island | Raja Ampat | 0.07 km² | — | — |
| Sagaf Yef Balbuli Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Yef Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Yef Kafya Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Yef Kala Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Yef Lanam Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Yef Not Island | Raja Ampat | 0.00 km² | — | — |
| Sagaf Yeffo Island | Raja Ampat | 0.01 km² | — | — |
| Sagaf Yefto Galyu Island | Raja Ampat | 0.00 km² | — | — |
| Sagaranusa Island | Fakfak | 0.01 km² | — | 50 m |
| Sagaro Nikapatcol Towasara Island | Raja Ampat | 0.00 km² | — | — |
| Sagatene Island | Teluk Bintuni | 0.78 km² | — | 24 m |
| Sagawin Island | Raja Ampat | 2.86 km² | — | 141 m |
| Sagemun Island | Sorong | 0.02 km² | — | — |
| Sagof Atsa Island | Raja Ampat | 0.00 km² | — | — |
| Sagof Fat Island | Raja Ampat | 0.00 km² | — | — |
| Sagof Fit Island | Raja Ampat | 0.02 km² | — | — |
| Sagof Lafa Island | Raja Ampat | 0.01 km² | — | — |
| Sagof Lafamailu Island | Raja Ampat | 0.00 km² | — | — |
| Sagof Lafamaisa Island | Raja Ampat | 0.01 km² | — | — |
| Sagof Lafamaitol Island | Raja Ampat | 0.02 km² | — | — |
| Sagof Lim Island | Raja Ampat | 0.00 km² | — | — |
| Sagof Lol Island | Raja Ampat | 0.02 km² | — | — |
| Sagof Lu Island | Raja Ampat | 0.01 km² | — | — |
| Sagof Nikapatcol Lenkalogos Island | Raja Ampat | 0.00 km² | — | — |
| Sagof Nikapatcol Tolea Island | Raja Ampat | 0.00 km² | — | — |
| Sagof Si Island | Raja Ampat | 0.01 km² | — | — |
| Sagof Wal Island | Raja Ampat | 0.00 km² | — | — |
| Sagof Wonom Island | Raja Ampat | 0.02 km² | — | — |
| Sagoria Island | Aru Islands Regency | 1.10 km² | — | — |
| Saguil Island | Raja Ampat | 0.01 km² | — | — |
| Saguilum Le Island | Raja Ampat | 0.01 km² | — | — |
| Saguilum Lol Island | Raja Ampat | 0.00 km² | — | — |
| Saguilum Palolon Island | Raja Ampat | 0.00 km² | — | — |
| Sagul Island | Raja Ampat | 0.00 km² | — | — |
| Sagul Yeben Island | Raja Ampat | 0.01 km² | — | — |
| Sagulbus Atsa Island | Raja Ampat | 0.00 km² | — | — |
| Sagulbus Genan Island | Raja Ampat | 0.01 km² | — | — |
| Sagulbus Island | Raja Ampat | 0.00 km² | — | — |
| Sagulbus Lu Island | Raja Ampat | 0.00 km² | — | — |
| Saibai Island | Queensland | 107.9 km² | 340 | 5 m |
| Sailul Island | Raja Ampat | 0.05 km² | — | 20 m |
| Sain Island | Central Halmahera | 24.9 km² | — | — |
| Saint Bees Island | Queensland | — | — | 37 m |
| Saint Clair Island | New South Wales | — | — | 194 m |
| Saint Francis Island | South Australia | — | — | 29 m |
| Saint Georges Island | Tasmania | — | — | 825 m |
| Saint Helena Island | Queensland | — | — | 4 m |
| Saint Helens Island | Tasmania | — | — | 21 m |
| Saint Huberts Island | New South Wales | — | — | 3 m |
| Saint Margaret Island | Victoria | — | — | 5 m |
| Saint Peter Island | South Australia | — | — | 24 m |
| Saisoso Island | Fakfak | 0.01 km² | — | — |
| Saiwhai Island | Aru Islands Regency | 3.84 km² | — | 24 m |
| Sakalamato Island | Raja Ampat | 0.01 km² | — | — |
| Sakao | Malampa | — | — | 20 m |
| Sakar Island | Morobe Province | 34 km² | — | 992 m |
| Sakarei Kecil Island | Teluk Bintuni | 3.07 km² | — | — |
| Sakori Island | Teluk Wondama | 0.02 km² | — | — |
| Sakukir Island | Supiori | 0.01 km² | — | — |
| Sakula Island | Aru Islands Regency | 0.00 km² | — | — |
| Salabafono Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Kapatcol Ganan Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Kapatcol Patetololya Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Kapatcol Tolasancaya Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Kapatcol Tololja Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Nikapatcol Tonataya Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Niyef Lapya Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Niyef Toleya Island | Raja Ampat | 0.00 km² | — | — |
| Salabafono Yepto Palenatalea Island | Raja Ampat | 0.00 km² | — | — |
| Salabafuno Atsa Island | Raja Ampat | 0.05 km² | — | — |
| Salabafuno Island | Raja Ampat | 0.01 km² | — | — |
| Salabafuno Lu Island | Raja Ampat | 0.01 km² | — | — |
| Salabafuno Tol Island | Raja Ampat | 0.00 km² | — | — |
| Salamlap Island | Raja Ampat | 0.00 km² | — | — |
| Salapi Island | Raja Ampat | 0.18 km² | — | — |
| Salawati Island | West Papua | 1,623 km² | — | 42 m |
| Salayef Island | Raja Ampat | 0.00 km² | — | — |
| Salep Island | Raja Ampat | 0.37 km² | — | — |
| Salter Island | Queensland | — | — | 24 m |
| Salulas Island | Fakfak | 0.00 km² | — | — |
| Salutun Genan Island | Raja Ampat | 0.16 km² | — | — |
| Salutun Pele Island | Raja Ampat | 1.97 km² | — | — |
| Sam Island | South Australia | — | — | 31 m |
| Samaga Ganan Island | Raja Ampat | 0.02 km² | — | — |
| Samaga Island | Raja Ampat | 0.26 km² | — | 11 m |
| Samaga Pale Island | Raja Ampat | 0.02 km² | — | — |
| Samai Island | Fakfak | 22.1 km² | — | 345 m |
| Samakuri Island | Biak Numfor | 0.03 km² | — | — |
| Samarai Islands | Milne Bay Province | 262.1 km² | — | — |
| Samasaf Island | Raja Ampat | 0.00 km² | — | — |
| Samatara Island | Aru Islands Regency | 0.03 km² | — | — |
| Sambomber Adamata Island | Fakfak | 0.05 km² | — | — |
| Sambomber Island | Fakfak | 0.02 km² | — | — |
| Sambunane Island | Fakfak | 0.00 km² | — | — |
| Samenen Island | Fakfak | 0.00 km² | — | — |
| Samios Island | Biak Numfor | 0.00 km² | — | — |
| Samnanam Island | Fakfak | 0.01 km² | — | — |
| Samom Island | Raja Ampat | 0.00 km² | — | — |
| Samoni Island | Yapen Islands | 0.00 km² | — | — |
| Samphire Island | Tasmania | — | — | 7 m |
| Samphire Island | Tasmania | — | — | 8 m |
| Sanai Tengko Island | Raja Ampat | 0.02 km² | — | — |
| Sanamnusa Island | Fakfak | 0.01 km² | — | — |
| Sanaroa Island | Milne Bay Province | 40 km² | 692 | — |
| Sanctuary Island | New South Wales | — | — | 59 m |
| Sand Cay | Queensland | — | — | 2 m |
| Sand Island | Northern Territory | — | — | 4 m |
| Sanders Island | Papua New Guinea | 0.70 km² | 0 | — |
| Sandey Island | Teluk Wondama | 0.00 km² | — | — |
| Sandfly Island | Northern Territory | — | — | 6 m |
| Sandfly Island | Queensland | — | — | 7 m |
| Sandstone Island | Victoria | — | — | 10 m |
| Sandy Bay Island | Auckland Region | — | — | 22 m |
| Sandy Island | Northern Territory | — | — | 8 m |
| Sandy Island | New South Wales | — | — | 1 m |
| Sandy Island | New South Wales | — | — | 259 m |
| Sandy Island | New South Wales | — | — | 294 m |
| Sandy Island | New South Wales | — | — | 17 m |
| Sandy Island | Queensland | — | — | 18 m |
| Sandy Island | Queensland | — | — | 325 m |
| Sandy Island | Queensland | — | — | 201 m |
| Sandy Island | South Australia | — | — | 23 m |
| Sandy Island | South Australia | — | — | 10 m |
| Sandy Island Number 1 | Northern Territory | — | — | 4 m |
| Sandy Island Number 2 | Northern Territory | — | 0 | — |
| Sandy Ridge | South Australia | — | — | 23 m |
| Sanggirui Island | Teluk Wondama | 0.05 km² | — | — |
| Santon Island | Raja Ampat | 0.16 km² | — | 8 m |
| Saonek Island | Raja Ampat | 0.26 km² | — | 6 m |
| Saonek Monde Island | Raja Ampat | 0.10 km² | — | 22 m |
| Saparang Ganan Island | Raja Ampat | 0.01 km² | — | — |
| Saparang Palay Island | Raja Ampat | 0.01 km² | — | — |
| Sapennipnu Island | Raja Ampat | 0.04 km² | — | — |
| Saplap Genan Island | Raja Ampat | 0.60 km² | — | — |
| Saplap Genan Polollo Island | Raja Ampat | 0.03 km² | — | — |
| Saplap Ket Island | Raja Ampat | 0.14 km² | — | — |
| Saplap Lil Island | Raja Ampat | 0.04 km² | — | — |
| Saplap Pele Island | Raja Ampat | 0.50 km² | — | — |
| Sapomi Island | Biak Numfor | 0.00 km² | — | — |
| Sapua Island | Fakfak | 0.00 km² | — | 102 m |
| Sarafa Island | Fakfak | 0.00 km² | — | — |
| Sarah Ann Rock | Tasmania | — | — | 144 m |
| Sarai Island | Raja Ampat | 0.02 km² | — | — |
| Sarajente Ganan Island | Raja Ampat | 0.02 km² | — | — |
| Sarajente Nibat Ganan Island | Raja Ampat | 0.01 km² | — | — |
| Sarajente Nibat Pale Island | Raja Ampat | 0.03 km² | — | — |
| Sarajente Pale Island | Raja Ampat | 0.03 km² | — | — |
| Sarakir Utara Island | Fakfak | 0.00 km² | — | — |
| Sarapai Island | Fakfak | 0.00 km² | — | — |
| Sarasini Kwakwa Island | Aru Islands Regency | 0.00 km² | — | — |
| Sarasini Sinnani Island | Aru Islands Regency | 0.00 km² | — | — |
| Sarati Island | Fakfak | 0.00 km² | — | — |
| Sarawiri Island | Teluk Wondama | 0.00 km² | — | — |
| Sareman Rewaun Island | Aru Islands Regency | 0.04 km² | — | — |
| Saretan Island | Fakfak | 0.00 km² | — | — |
| Sarias Natuk Island | Fakfak | 0.00 km² | — | — |
| Sarias Nenem Island | Fakfak | 0.02 km² | — | — |
| Sariasi Beba Island | Supiori | 0.00 km² | — | — |
| Sariasi Kasun Island | Supiori | 0.00 km² | — | — |
| Sariba | Milne Bay Province | 23.2 km² | — | 296 m |
| Sariba Apara Island | Aru Islands Regency | 0.09 km² | — | — |
| Sariba Island | Aru Islands Regency | 1.40 km² | — | — |
| Sariba Semar Island | Aru Islands Regency | 0.11 km² | — | — |
| Sarigar Island | Fakfak | 0.43 km² | — | 45 m |
| Sarigasumar Girif Island | Fakfak | 0.01 km² | — | — |
| Sarigasumar Island | Fakfak | 0.06 km² | — | — |
| Sariwe Island | Nabire | 4.07 km² | — | 86 m |
| Sark Island | Queensland | — | — | 7 m |
| Sarmi Island | Sarmi | 0.04 km² | — | 18 m |
| Sarwandori Island | Yapen Islands | 0.00 km² | — | — |
| Sasifi Island | Eastern Seram | 0.01 km² | — | — |
| Sasoi Baba Island | Teluk Wondama | 1.33 km² | — | — |
| Sasoi Katu Island | Teluk Wondama | 0.00 km² | — | — |
| Sassie Island | Queensland | 10.1 km² | 0 | 14 m |
| Satawal | Satawal Municipality | 1.10 km² | 531 | — |
| Satawan | Chuuk | 4.60 km² | — | — |
| Satellite Island | Queensland | — | — | 8 m |
| Saunders Islet | Queensland | 0.11 km² | — | 6 m |
| Saunders Patch | Tiwi Islands Region | — | — | 5 m |
| Saur Tataun Island | Fakfak | 0.00 km² | — | — |
| Saur Temun Island | Fakfak | 0.00 km² | — | — |
| Sauris Island | Raja Ampat | 0.01 km² | — | — |
| Savai'i | Samoa | 1,718 km² | 100,000 | 1,858 m |
| Sawaki Island | Teluk Wondama | 0.00 km² | — | — |
| Sawar Island | Sarmi | 0.19 km² | — | 16 m |
| Sawatersalot Selatan Island | Fakfak | 0.00 km² | — | — |
| Sawatersalot Tataun Island | Fakfak | 0.00 km² | — | — |
| Sawatersalot Tengah Island | Fakfak | 0.00 km² | — | — |
| Sawer Island | Southeast Maluku | 0.00 km² | — | — |
| Saweru Island | Yapen Islands | 5.48 km² | — | 132 m |
| Sawewua Island | Teluk Wondama | 0.00 km² | — | — |
| Sawufujen Ganan Island | Raja Ampat | 0.00 km² | — | — |
| Sawufujen Pale Island | Raja Ampat | 0.00 km² | — | — |
| Sayang Diyef Island | Raja Ampat | 0.00 km² | — | — |
| Sayce Island | Victoria | — | — | 23 m |
| Sayonufori Island | Yapen Islands | 0.00 km² | — | — |
| Scawfell Island | Queensland | — | — | 147 m |
| Scelebsprung Islet | Peleliu | — | 0 | — |
| Schnapper Reef | New South Wales | — | — | 30 m |
| Schouten Island | Tasmania | 28 km² | 0 | 188 m |
| Scotts Island | Tasmania | — | — | 181 m |
| Scotts Island | Shire of Moira | — | — | 127 m |
| Scrub Island | Queensland | — | — | 19 m |
| Scrubby Island | Victoria | — | — | 2 m |
| Seacrow Islet | Tasmania | — | — | 1 m |
| Seaforth Island | Queensland | — | — | 31 m |
| Seagull Island | South Australia | — | — | 5 m |
| Seagull Rock | Tasmania | — | — | 29 m |
| Seal Island | South Australia | 1 km² | — | 12 m |
| Seal Island | South Australia | — | — | 35 m |
| Seal Island | Victoria | — | — | 48 m |
| Seal Rocks | Tasmania | — | — | 29 m |
| Sealark Patch | Queensland | — | — | 1 m |
| Sebai | Indonesia | — | — | 13 m |
| Second Island | Northern Territory | — | — | 5 m |
| Second Island | Victoria | — | — | 4 m |
| Secretary Island | Southland District | 81 km² | 0 | 1,196 m |
| Sego Island | Sorong | 0.08 km² | — | 14 m |
| Sego Masmas Island | Sorong | 0.06 km² | — | 11 m |
| Seira Island | Tanimbar Islands | 95.8 km² | — | 26 m |
| Sejer Island | Aru Islands Regency | 0.01 km² | — | 8 m |
| Sekar Barat Island | Fakfak | 0.01 km² | — | — |
| Sekar Darat Island | Fakfak | 0.00 km² | — | — |
| Sekar Island | Fakfak | 0.01 km² | — | — |
| Sekar Laut Island | Fakfak | 0.00 km² | — | — |
| Selaru Island | Tanimbar Islands | 775 km² | 12,249 | 33 m |
| Selebus Island | Sorong | 0.11 km² | — | — |
| Selsel Island | Aru Islands Regency | 0.01 km² | — | — |
| Selu Island | Tanimbar Islands | 84.7 km² | — | 95 m |
| Sem Island | Raja Ampat | 0.03 km² | — | — |
| Semai Island | Aru Islands Regency | 0.21 km² | — | — |
| Semni | Indonesia | — | — | 30 m |
| Senators Rock | Tasmania | — | — | 1,019 m |
| Senemi Island | Supiori | 0.02 km² | — | — |
| Sengar Island | Aru Islands Regency | 0.36 km² | — | — |
| Sengar Sian Island | Aru Islands Regency | 0.01 km² | — | — |
| Senogotul Island | Sorong | 0.11 km² | — | — |
| Sensau Island | Jayapura | 0.00 km² | — | — |
| Sentarai Island | Sorong | 0.16 km² | — | — |
| Senyu Ganan Island | Raja Ampat | 0.36 km² | — | — |
| Senyu Pale Island | Raja Ampat | 1.00 km² | — | 14 m |
| Sepatu Island | Raja Ampat | 1.57 km² | — | — |
| Sepulchre Island | New South Wales | — | — | 13 m |
| Seram Laut Island | Eastern Seram | 9.10 km² | — | 74 m |
| Serar Island | Aru Islands Regency | 0.48 km² | — | 18 m |
| Sernusa Island | Fakfak | 0.00 km² | — | — |
| Serpentine Island | Tasmania | — | — | 304 m |
| Serua Island | Central Maluku | 6.52 km² | 2,002 | 641 m |
| Serwaku Island | Aru Islands Regency | 0.20 km² | — | — |
| Seten Liu Inu Ai Ha Island | Raja Ampat | 0.09 km² | — | — |
| Sewer | Maluku | — | — | 18 m |
| Sewerjal Island | Aru Islands Regency | 0.00 km² | — | — |
| Sewinilelen Lol Island | Raja Ampat | 0.00 km² | — | — |
| Sewinilelen Yeben Island | Raja Ampat | 0.01 km² | — | — |
| Seymour Island | Southland District | — | 0 | — |
| Shag Island | South Australia | — | — | 4 m |
| Shag Island | Victoria | — | — | 3 m |
| Shag Reef | Tasmania | 0.01 km² | — | — |
| Shag Rock | Tasmania | — | — | 2 m |
| Shallow Island | New South Wales | — | — | 47 m |
| Shark Island | New South Wales | — | — | 2 m |
| Shaw Island | Queensland | — | — | 163 m |
| She Oak Island | Queensland | — | — | 5 m |
| Sheep Island | New South Wales | — | — | 14 m |
| Sheep Island | Queensland | — | — | 4 m |
| Sheep Island | Victoria | — | — | 1 m |
| Shell Island | New South Wales | — | — | 11 m |
| Shell Islets | Tasmania | — | — | 2 m |
| Shellback Island | Victoria | — | — | 84 m |
| Shelley Island | New South Wales | — | — | 11 m |
| Shelly Island | New South Wales | — | — | 11 m |
| Shelly Knob | Queensland | — | — | 1 m |
| Shelter Island | Queensland | — | — | 4 m |
| Sheoak Island | South Australia | — | — | 23 m |
| Sheridan Island | Queensland | — | — | 2 m |
| Sherrard Island | Queensland | 0.02 km² | — | — |
| Shields Island | Queensland | — | — | 18 m |
| Shingle Island | Tasmania | — | — | 25 m |
| Shoobridge Island | Tasmania | — | — | 1,041 m |
| Short Island | Queensland | — | — | 4 m |
| Shute Island | Queensland | — | — | 42 m |
| Si Island | Nabire | 0.12 km² | — | — |
| Siadarau Island | Aru Islands Regency | 9.69 km² | — | — |
| Siagra Nus Island | Raja Ampat | 0.00 km² | — | — |
| Sianiri Besar Island | Teluk Bintuni | 78.1 km² | — | 1 m |
| Sianiri Island | Teluk Bintuni | 3.75 km² | — | — |
| Sianiri Kecil Island | Teluk Bintuni | 47.6 km² | — | — |
| Sibir Island | Jayapura | 0.00 km² | — | — |
| Sibsey Island | South Australia | — | — | 24 m |
| Sibuak Besar Island | Fakfak | 0.00 km² | — | — |
| Sibuak Kecil Island | Fakfak | 0.00 km² | — | — |
| Sideia Island | Milne Bay Province | 101.3 km² | — | 377 m |
| Sidney Island | Queensland | — | — | 9 m |
| Sien Island | Aru Islands Regency | 0.00 km² | — | — |
| Sife Ain Anak Island | Tanimbar Islands | 0.00 km² | — | — |
| Sife Ain Dol Island | Tanimbar Islands | 0.00 km² | — | — |
| Sife Ain Island | Tanimbar Islands | 0.01 km² | — | — |
| Sikoikoi Island | Aru Islands Regency | 0.09 km² | — | — |
| Silaar Island | Southeast Maluku | 0.04 km² | — | — |
| Sillago Island | Queensland | — | — | 17 m |
| Silversmith Island | Queensland | — | — | 44 m |
| Sima Island | Aru Islands Regency | 0.01 km² | — | — |
| Simaborai Island | Aru Islands Regency | 0.01 km² | — | — |
| Simangitboban Island | Fakfak | 0.01 km² | — | — |
| Simbakora Island | Aru Islands Regency | 0.00 km² | — | — |
| Simberi Island | New Ireland Province | 40 km² | 1,100 | 340 m |
| Simboro Island | Fakfak | 0.04 km² | — | — |
| Simere Island | Fakfak | 0.04 km² | — | — |
| Simere Natuk Island | Fakfak | 0.00 km² | — | — |
| Simere Nenem Island | Fakfak | 0.01 km² | — | — |
| Simeri Island | Teluk Bintuni | 9.90 km² | — | — |
| Simmons Mistake | Tasmania | — | — | 1 m |
| Sims Island | Northern Territory | — | — | 6 m |
| Sinai Island | Aru Islands Regency | 0.01 km² | — | — |
| Sinan Aben Gwau Island | Aru Islands Regency | 0.00 km² | — | — |
| Sinan Aben Island | Aru Islands Regency | 0.02 km² | — | — |
| Sinclair Island | South Australia | — | — | 3 m |
| Sindilabono Island | Raja Ampat | 0.00 km² | — | — |
| Sing Kepow Island | Jayapura | 0.00 km² | — | — |
| Sinking Rock | Tasmania | — | — | 5 m |
| Siorangsitatau Barat Island | Fakfak | 0.00 km² | — | — |
| Siorangsitatau Island | Fakfak | 0.01 km² | — | — |
| Siorangsitatau Tengah Island | Fakfak | 0.00 km² | — | — |
| Siorangsitatau Utara Island | Fakfak | 0.00 km² | — | — |
| Sipurupui Island | Teluk Wondama | 0.02 km² | — | — |
| Sipururui Island | Teluk Wondama | 0.00 km² | — | — |
| Sir Joseph Banks Group | South Australia | — | — | 8 m |
| Sirankeribo Island | Yapen Islands | 0.08 km² | — | — |
| Sirapisi Island | Fakfak | 0.03 km² | — | — |
| Sirbel Island | Aru Islands Regency | 0.03 km² | — | — |
| Sirit Island | Fakfak | 0.01 km² | — | — |
| Sirjoir Island | Aru Islands Regency | 0.00 km² | — | — |
| Sirlau Island | Aru Islands Regency | 0.08 km² | — | — |
| Sirlawi Island | Aru Islands Regency | 0.08 km² | — | — |
| Sirnai Island | Aru Islands Regency | 0.77 km² | — | — |
| Sirnam Island | Aru Islands Regency | 0.08 km² | — | — |
| Sirpapa Island | Aru Islands Regency | 0.01 km² | — | — |
| Sirsir Island | Aru Islands Regency | 1.43 km² | — | — |
| Sirtui Island | Aru Islands Regency | 0.00 km² | — | — |
| Sirwaku Island | Aru Islands Regency | 0.02 km² | — | — |
| Sirway Island | Aru Islands Regency | 0.46 km² | — | — |
| Sisi Darat Island | Sorong | 0.65 km² | — | — |
| Sisi Ganan Island | Raja Ampat | 0.00 km² | — | — |
| Sisi Laut Island | Sorong | 0.21 km² | — | — |
| Sisi Pale Island | Raja Ampat | 0.16 km² | — | 31 m |
| Sisi Palolon Island | Raja Ampat | 0.00 km² | — | — |
| Sisir Island | Fakfak | 0.01 km² | — | — |
| Sisters Island | Queensland | 0.04 km² | — | — |
| Sisters Island | Tasmania | 0.01 km² | — | — |
| Sisters Rocks | Tasmania | — | — | 271 m |
| Sitabarinai Island | Teluk Bintuni | 28.7 km² | — | — |
| Sitafukruakrua Island | Teluk Bintuni | 37.4 km² | — | — |
| Sitdimpol Island | Raja Ampat | 0.02 km² | — | — |
| Sitpopoyef Ganan Island | Raja Ampat | 0.00 km² | — | — |
| Sitpopoyef Les Island | Raja Ampat | 0.00 km² | — | — |
| Sitpopoyef Matlolo Island | Raja Ampat | 0.00 km² | — | — |
| Sivivi Island | Eastern Seram | 0.00 km² | — | — |
| Siwa Island | Aru Islands Regency | 0.14 km² | — | — |
| Siwanjawutu Besar Island | Kaimana | 0.00 km² | — | — |
| Sketchleys Island | New South Wales | — | — | 8 m |
| Skottowe Shoal | Northern Territory | — | — | 8 m |
| Skull Island | New South Wales | — | — | 539 m |
| Skull Island | Pellew Islands | — | — | 28 m |
| Skull Rock | Victoria | — | — | 66 m |
| Slade Island | Queensland | — | — | 4 m |
| Slain Island | Queensland | — | — | 3 m |
| Slaney Island | South Australia | — | — | 27 m |
| Slip Island | New South Wales | — | — | 3 m |
| Sloping Island | Queensland | — | — | 41 m |
| Sloping Island | Tasmania | — | — | 30 m |
| Small Islet | Northern Territory | — | — | 4 m |
| Smith Island | South Australia | — | — | 29 m |
| Smith Island | Queensland | — | — | 50 m |
| Smiths Island | New South Wales | — | — | 6 m |
| Smooth Island | South Australia | — | — | 35 m |
| Smooth Island | Tasmania | — | — | 44 m |
| Snaggy Island | Victoria | — | — | 1 m |
| Snake Island | Victoria | 35 km² | — | 3 m |
| Snake Island | South Australia | — | — | 2 m |
| Snake Island | South Australia | — | — | 8 m |
| Snake Island | New South Wales | — | — | 130 m |
| Snake Island | Victoria | — | — | 1 m |
| Snake Island | New South Wales | — | — | 1 m |
| Snake Island | New South Wales | — | — | 60 m |
| Snake Island | New South Wales | — | — | 37 m |
| Snake Island | New South Wales | — | — | 15 m |
| Snake Island | New South Wales | — | — | 200 m |
| Snake Island | New South Wales | — | — | 703 m |
| Snake Island | New South Wales | — | — | 151 m |
| Snake Island | South Australia | — | — | 48 m |
| Snake Island | Tasmania | — | — | 221 m |
| Snake Island | Tasmania | — | — | 16 m |
| Snake Rock | Tasmania | — | — | 598 m |
| Snapper Island | Queensland | 0.66 km² | — | 74 m |
| Snapper Island | New South Wales | 0.34 km² | — | — |
| Snare Peak Island | Queensland | — | — | 44 m |
| Sneaker Rocks | Tasmania | — | — | 7 m |
| Snebai Island | Supiori | 0.01 km² | — | — |
| Snipe Island | New South Wales | — | — | 1,154 m |
| Snipe Island | South Australia | — | — | 5 m |
| Snob Rock | Tasmania | — | — | 6 m |
| Snobbys Rock | Tasmania | — | — | 217 m |
| Soalawala Island | Fakfak | 0.00 km² | — | — |
| Sobrain Maralol Island | Raja Ampat | 0.01 km² | — | — |
| Sokwa Risa Island | Aru Islands Regency | 0.63 km² | — | — |
| Solder Island | Queensland | — | — | 10 m |
| Soldier's Cap Island | New South Wales | — | — | 10 m |
| Soldiers Island | Tasmania | — | — | 1 m |
| Solkope | Rotuma | 0.30 km² | — | 128 m |
| Somarwain Atakanak Island | Tanimbar Islands | 0.00 km² | — | — |
| Somarwain Silai Island | Tanimbar Islands | 0.00 km² | — | — |
| Somarwaintubun Island | Tanimbar Islands | 0.00 km² | — | — |
| Somarwaintubun Utara Island | Tanimbar Islands | 0.00 km² | — | — |
| Sombokoro Island | Teluk Wondama | 1.04 km² | — | 15 m |
| Somerwoo Island | Asmat | 2.52 km² | — | 14 m |
| Sometime Island | Victoria | — | — | 197 m |
| Somresi Island | Supiori | 0.00 km² | — | — |
| Songarommeta Island | Kaimana | 0.00 km² | — | — |
| Soo Island | Raja Ampat | 0.02 km² | — | — |
| Sopa Island | Raja Ampat | 0.00 km² | — | — |
| Sopoon Island | Raja Ampat | 0.43 km² | — | 17 m |
| Sorfor Island | Teluk Bintuni | 93.3 km² | — | — |
| Sorol | Yap State | 0.93 km² | — | 2 m |
| Sosora Island | Fakfak | 0.00 km² | — | — |
| South Barren Island | Queensland | — | — | 14 m |
| South Diamond Islet | Queensland | — | — | 21 m |
| South Direction Island | Queensland | 0.49 km² | — | 1 m |
| South Goulburn Island | Northern Territory | — | — | 10 m |
| South Island | New Zealand | 150,437 km² | 1,115,800 | — |
| South Island | Queensland | — | — | 10 m |
| South Island | Shire of Cook | — | — | 75 m |
| South Island | Queensland | — | — | 29 m |
| South Island | Queensland | — | — | 41 m |
| South Island | South Australia | — | — | 1 m |
| South Island | South Australia | — | — | 18 m |
| South Molle Island | Queensland | 4.66 km² | — | 57 m |
| South Page | South Australia | — | — | 9 m |
| South Red Cliff Island | Queensland | — | — | 29 m |
| South Reef | New South Wales | — | — | 8 m |
| South Repulse Island | Queensland | — | — | 5 m |
| South Solitary Island Historic Site | New South Wales | 0.10 km² | — | — |
| South Stradbroke Island | Queensland | — | 142 | 16 m |
| South Trees Island | Queensland | — | — | 7 m |
| South West Bromby Islet | Northern Territory | — | — | 21 m |
| South West Cay | Queensland | — | — | 5 m |
| South West Cay | Queensland | — | — | 3 m |
| South West Island | Northern Territory | — | — | 32 m |
| South West Isle | Tasmania | — | — | 120 m |
| South West Islet | Queensland | — | — | 10 m |
| South West Mutton Bird Islet | Tasmania | — | — | 28 m |
| South West Vernon Island | Northern Territory | — | — | 8 m |
| Sowai | Indonesia | — | — | 1 m |
| Sowek Island | Supiori | 9.32 km² | — | — |
| Sowek Island | Teluk Wondama | 0.00 km² | — | — |
| Sowowawini Island | Teluk Wondama | 0.00 km² | — | — |
| Soyil Island | Raja Ampat | 0.00 km² | — | — |
| Spec Island | Victoria | — | — | 2 m |
| Spectacle Island | New South Wales | — | — | 1,262 m |
| Spectacle Island | New South Wales | — | — | 87 m |
| Speewa Island | New South Wales | — | — | 65 m |
| Spencer Island | Queensland | — | — | 29 m |
| Sphinx Islet | Queensland | — | — | 10 m |
| Spiewah Island | New South Wales | — | — | 65 m |
| Spike Island | Tasmania | 6 km² | 0 | — |
| Spilsby Island | South Australia | — | — | 6 m |
| Spinnaker Island | Australian Capital Territory | — | — | 554 m |
| Spit Island | New South Wales | — | — | 10 m |
| Spit Island | Queensland | — | — | 17 m |
| Splatts Island | Victoria | — | — | 73 m |
| Split Island | Queensland | — | — | 18 m |
| Springbank Island | Canberra | — | — | 558 m |
| Spur Island | Victoria | — | — | 90 m |
| Spy Island | Tasmania | — | — | 10 m |
| St Bees Island | Queensland | — | — | 219 m |
| St Helena | New South Wales | — | — | 54 m |
| St Helena Island | New South Wales | — | — | 54 m |
| St Helena Island | Queensland | — | — | 11 m |
| St Helens Island | Tasmania | 51 km² | — | — |
| St Huberts Island | Kincumber | — | 1,080 | — |
| St Peter Island | District Council of Ceduna | — | — | 42 m |
| St Peter Island | South Australia | — | — | 28 m |
| St. Clair Island | Queensland | — | — | 3 m |
| Stack Island | Circular Head | 0.15 km² | — | 17 m |
| Stanley Island | Queensland | — | — | 73 m |
| Stanley Island | South Australia | — | — | 27 m |
| Stanley Island | Queensland | — | — | 78 m |
| Stapleton Island | Queensland | — | — | 5 m |
| Steeles Island | Tasmania | — | — | 40 m |
| Steep Island | Circular Head | — | — | 47 m |
| Steep-to Island | Southland District | — | — | 132 m |
| Steeple Rock | Tasmania | — | — | 1 m |
| Stephens Island | Queensland | 0.37 km² | 76 | 27 m |
| Stephens Island / Takapourewa | Marlborough District | 1.84 km² | 0 | — |
| Stephens Islet | Torres Strait Island Region | — | — | 29 m |
| Stephenson Island | Far North District | 1.22 km² | 0 | — |
| Stevens Island | Northern Territory | — | — | 27 m |
| Stevensons Island | Queenstown Lakes District | 0.65 km² | — | 325 m |
| Stewart Island | Queensland | — | — | 1 m |
| Stewart Island/Rakiura | Southland District | 1,746 km² | 381 | 980 m |
| Stewenoo Island | West Papua | — | — | 18 m |
| Stickney Island | South Australia | — | — | 23 m |
| Stingaree Island | Queensland | — | — | 6 m |
| Stingaree Reefs | Queensland | — | — | 24 m |
| Stone Island | Queensland | — | — | 5 m |
| Stone Island | Queensland | — | — | 6 m |
| Stone Island | Queensland | — | — | 6 m |
| Stonehenge | Queensland | — | — | 19 m |
| Stony Well Island | South Australia | — | — | 5 m |
| Storehouse Island | Tasmania | 20 km² | — | 3 m |
| Stotts Island Nature Reserve | New South Wales | — | — | 3 m |
| Struck Island | Queensland | 0.00 km² | — | — |
| Stuarts Island | New South Wales | — | — | 3 m |
| Sturt Island | Australian Capital Territory | — | — | 444 m |
| Sua Island | Tual | 0.05 km² | — | 16 m |
| Suandei Island | Yapen Islands | 0.28 km² | — | 230 m |
| Suandey Island | Teluk Wondama | 0.00 km² | — | — |
| Suarji Island | Queensland | — | — | 102 m |
| Suawala Island | Kaimana | 0.00 km² | — | — |
| Subleley Island | Raja Ampat | 0.00 km² | — | — |
| Subleley Palay Island | Raja Ampat | 0.00 km² | — | — |
| Sudden Jerk Island | South Australia | — | — | 18 m |
| Sue Islet | Queensland | 0.74 km² | 287 | 9 m |
| Sugarloaf Island | New South Wales | — | — | 7 m |
| Sugu Tusi | Milne Bay Province | — | — | 5 m |
| Sukler Island | Tanimbar Islands | 0.44 km² | — | 7 m |
| Sukmemere Nusnuse Natuk Island | Fakfak | 0.00 km² | — | — |
| Sukmemere Nusnuse Nenem Island | Fakfak | 0.00 km² | — | — |
| Sul Po Lutwai Island | Raja Ampat | 0.00 km² | — | — |
| Sulpuk Atsa Island | Raja Ampat | 0.00 km² | — | — |
| Sulpuk Lim Island | Raja Ampat | 0.01 km² | — | — |
| Sulpuk Lu Island | Raja Ampat | 0.01 km² | — | — |
| Sulpuk Tol Island | Raja Ampat | 0.01 km² | — | — |
| Sulpuk Wonom Island | Raja Ampat | 0.01 km² | — | — |
| Sumalelen Nikapatcol Kalekettololya Island | Raja Ampat | 0.00 km² | — | — |
| Sumalelen Yef Pale Island | Raja Ampat | 0.01 km² | — | — |
| Sumpapo Les Island | Raja Ampat | 0.00 km² | — | — |
| Sumpapo Lool Island | Raja Ampat | 0.00 km² | — | — |
| Sumpapo Sawi Island | Raja Ampat | 0.01 km² | — | — |
| Sumuilap Les Island | Raja Ampat | 5.50 km² | — | — |
| Sumuilapo Lool Island | Raja Ampat | 5.52 km² | — | — |
| Sun Island | Aru Islands Regency | 0.02 km² | — | — |
| Sun Island | Queensland | — | — | 9 m |
| Sunday Island | Victoria | — | — | 12 m |
| Sunday Islet | Queensland | 0.15 km² | — | 31 m |
| Sunmalele Atsa Island | Raja Ampat | 0.03 km² | — | — |
| Sunmalele Fat Island | Raja Ampat | 0.01 km² | — | — |
| Sunmalele Fit Island | Raja Ampat | 0.02 km² | — | — |
| Sunmalele Island | Raja Ampat | 0.04 km² | — | — |
| Sunmalele Lafa Island | Raja Ampat | 0.01 km² | — | — |
| Sunmalele Lafalu Island | Raja Ampat | 0.00 km² | — | — |
| Sunmalele Lafamaifat Island | Raja Ampat | 0.01 km² | — | — |
| Sunmalele Lafamaifit Island | Raja Ampat | 0.00 km² | — | — |
| Sunmalele Lafamailim Island | Raja Ampat | 0.01 km² | — | — |
| Sunmalele Lafamailu Island | Raja Ampat | 0.03 km² | — | — |
| Sunmalele Lafamaisa Island | Raja Ampat | 0.02 km² | — | — |
| Sunmalele Lafamaitol Island | Raja Ampat | 0.01 km² | — | — |
| Sunmalele Lafamaiwa Island | Raja Ampat | 0.01 km² | — | — |
| Sunmalele Lafamaiwonom Island | Raja Ampat | 0.00 km² | — | — |
| Sunmalele Lim Island | Raja Ampat | 0.04 km² | — | — |
| Sunmalele Lulafamaisi Island | Raja Ampat | 0.01 km² | — | — |
| Sunmalele Si Island | Raja Ampat | 0.01 km² | — | — |