| Maabel Ai Lu Island | Raja Ampat | 0.01 km² | — | — |
| Maabel Ai Tol Island | Raja Ampat | 0.00 km² | — | — |
| Maabel Katem Island | Raja Ampat | 0.00 km² | — | — |
| Maar Barat Island | Aru Islands Regency | 0.01 km² | — | — |
| Maar Kecil Island | Aru Islands Regency | 0.00 km² | — | — |
| Maar Timur Island | Aru Islands Regency | 0.01 km² | — | — |
| Maatsuyker Island | Tasmania | 186 km² | 0 | 284 m |
| Mabel Island | Queensland | 0.03 km² | — | 10 m |
| Mabuiag Island | Queensland | 7.40 km² | 253 | 67 m |
| Mabunitarereikwaen Island | Fakfak | 0.00 km² | — | — |
| Macarthur Islands | Queensland | — | — | 8 m |
| Macdonell Island | Southland District | — | — | 100 m |
| Macintosh Island | Queensland | — | — | 4 m |
| Mackay Island | Queensland | — | — | 8 m |
| Mackenzie Island | Queensland | — | — | 2 m |
| Mackenzies Island | New South Wales | — | — | 2 m |
| MacLanachans Island | Tasmania | — | — | 1,034 m |
| MacLanachans Point Island | Tasmania | — | — | 1,043 m |
| Maclear Island | Queensland | 0.08 km² | — | 20 m |
| Macleay Island | Queensland | — | 3,193 | 15 m |
| Macondle Island | New South Wales | — | — | 7 m |
| Macredie Island | Victoria | — | — | 62 m |
| Macs Rock | Tasmania | — | — | 802 m |
| Macvean Island | New South Wales | — | — | 152 m |
| Madawan Island | Fakfak | 0.01 km² | — | — |
| Madiana Island | Nabire | 0.01 km² | — | — |
| Madoran Island | Eastern Seram | 0.04 km² | — | 10 m |
| Maduwa | Indonesia | — | — | 23 m |
| Maewo | Penama | 303 km² | 3,569 | 795 m |
| Mafor Island | Raja Ampat | 0.00 km² | — | — |
| Mafor Sawi Island | Raja Ampat | 0.00 km² | — | — |
| Maga Island | Raja Ampat | 1.24 km² | — | 1 m |
| Magazine Island | Queensland | — | — | 9 m |
| Magazine Island | Queensland | — | — | 7 m |
| Magazine Island | Tasmania | — | — | 10 m |
| Magnetic Island | Queensland | 52 km² | 2,107 | 315 m |
| Magnetic Island | Queensland | — | — | 20 m |
| Mago Island | Lau | 22 km² | 35 | — |
| Magra Islet | Queensland | — | — | 6 m |
| Mahara Island | Southland District | — | — | 245 m |
| Mahena Island | Northland Region | — | — | 1 m |
| Maher Island | Queensland | — | — | 109 m |
| Mahinapua Rocks | Waikato Region | — | — | 43 m |
| Mahuki Island / Anvil Island | Auckland Region | — | — | 75 m |
| Mahurangi Island | Auckland Region | — | — | 49 m |
| Mahurangi Island (Goat Island) | Waikato Region | 0.06 km² | — | 38 m |
| Mai Islet | Queensland | — | — | 50 m |
| Maiana | Gilbert Islands | 16.7 km² | 2,345 | 3 m |
| Maikoor Island | Maluku | 397.6 km² | — | 20 m |
| Main Island | South Australia | — | — | 45 m |
| Maina | Cook Islands | — | — | 10 m |
| Maine Island | West Arnhem Region | — | — | 1 m |
| Mainu Island | Yapen Islands | 0.01 km² | — | — |
| Maipi Island | Yapen Islands | 0.01 km² | — | — |
| Mairan Island | Aru Islands Regency | 0.03 km² | — | — |
| Maiwani Island | Yapen Islands | 0.00 km² | — | — |
| Maiyefun Untuyo Ganan Island | Raja Ampat | 0.01 km² | — | — |
| Maiyefun Untuyo Palay Island | Raja Ampat | 0.01 km² | — | — |
| Majar Island | Aru Islands Regency | 1.75 km² | — | 11 m |
| Majimfemen Island | Raja Ampat | 0.08 km² | — | 17 m |
| Majors Rocks | Tasmania | — | — | 13 m |
| Makada | East New Britain Province | 3.60 km² | — | — |
| Makai Island | Teluk Bintuni | 7.06 km² | — | — |
| Makanoli Besar Island | Eastern Seram | 0.00 km² | — | — |
| Makanoli Sedang Island | Eastern Seram | 0.00 km² | — | — |
| Makarasi Island | Teluk Wondama | 0.00 km² | — | — |
| Makeeatta | Cook Islands | — | — | 1 m |
| Makepeace Island | Queensland | — | — | 8 m |
| Maketu Island | Wellington Region | — | — | 356 m |
| Makin | Gilbert Islands | 7.89 km² | 2,385 | 3 m |
| Makmak Island | Sorong | 2.27 km² | — | 21 m |
| Makogai | Lomaiviti | 8.40 km² | — | — |
| Makoka Island | Eastern Seram | 0.00 km² | — | — |
| Makoka Timur Island | Eastern Seram | 0.00 km² | — | — |
| Makura | Shefa | — | — | 132 m |
| Malabubai Kwakwa Island | Aru Islands Regency | 0.15 km² | — | — |
| Malabubi Cinani Island | Aru Islands Regency | 0.01 km² | — | — |
| Malakal Island | Palau | 1.10 km² | — | — |
| Malakula Island | Malampa | 2,041 km² | 20,000 | 879 m |
| Malamba Ganan Island | Raja Ampat | 0.00 km² | — | — |
| Malamba Pale Island | Raja Ampat | 0.02 km² | — | — |
| Malekpon Ai Fat Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ai Fit Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ai Lafa Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ai Lim Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ai Lu Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ai Sa Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ai Si Island | Raja Ampat | 0.04 km² | — | — |
| Malekpon Ai Tol Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ja Ma Fat Island | Raja Ampat | 0.01 km² | — | — |
| Malekpon Ja Ma Fit Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ja Ma Lim Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ja Ma Tem Island | Raja Ampat | 0.02 km² | — | — |
| Malekpon Ja Ma Tol Island | Raja Ampat | 0.01 km² | — | — |
| Malekpon Ja Ma Wal Island | Raja Ampat | 0.00 km² | — | — |
| Malekpon Ja Ma Wonom Island | Raja Ampat | 0.00 km² | — | — |
| Maliwai Atsa Island | Raja Ampat | 0.49 km² | — | — |
| Maliwai Fat Island | Raja Ampat | 0.00 km² | — | — |
| Maliwai Fit Island | Raja Ampat | 0.00 km² | — | — |
| Maliwai Lim Island | Raja Ampat | 0.00 km² | — | — |
| Maliwai Lu Island | Raja Ampat | 0.00 km² | — | — |
| Maliwai Si Island | Raja Ampat | 0.03 km² | — | — |
| Maliwai Tol Island | Raja Ampat | 0.00 km² | — | — |
| Maliwai Wal Island | Raja Ampat | 0.00 km² | — | — |
| Maliwai Wonom Island | Raja Ampat | 0.00 km² | — | — |
| Mallison Island | Northern Territory | — | — | 28 m |
| Malmalaidi Island | Aru Islands Regency | 0.12 km² | — | — |
| Malmalajurin Island | Aru Islands Regency | 18.4 km² | — | 24 m |
| Malo Island | Sanma | 180 km² | 4,279 | 163 m |
| Maloelap Atoll | Marshall Islands | 9.80 km² | — | 3 m |
| Malokilikili | Sanma | — | — | 20 m |
| Malolo | Ba | 9.60 km² | — | — |
| Malongi Island | Aru Islands Regency | 0.53 km² | — | — |
| Malparavu Island | Sanma | — | — | 15 m |
| Maltinérava Island | Sanma | — | — | 38 m |
| Malumandin Island | Aru Islands Regency | 0.00 km² | — | — |
| Malvanua Island | Sanma | — | — | 15 m |
| Malvapévu Island | Sanma | — | — | 12 m |
| Malwépé Island | Sanma | — | — | 16 m |
| Mam Dadi | Indonesia | — | — | 12 m |
| Mama Mon Minsiar Island | Raja Ampat | 0.00 km² | — | — |
| Mamaki | Indonesia | — | — | 12 m |
| Mamboo Island | New South Wales | — | — | 1 m |
| Mambraku Island | Raja Ampat | 0.00 km² | — | — |
| Mambruk Island | Teluk Wondama | 0.00 km² | — | — |
| Mampaga Island | Fakfak | 0.00 km² | — | — |
| Mamwatuprar Lim Island | Tanimbar Islands | 0.00 km² | — | — |
| Mamwatuprar Tel Island | Tanimbar Islands | 0.00 km² | — | — |
| Mana Island | Wellington Region | 2.17 km² | 0 | 121 m |
| Manam | Madang Province | 83 km² | 10,677 | 1,807 m |
| Manare Island | Raja Ampat | 0.01 km² | — | — |
| Manarui Island | Raja Ampat | 0.08 km² | — | 1 m |
| Manawas Island | Fakfak | 0.01 km² | — | — |
| Manawas Natuks Island | Fakfak | 0.00 km² | — | — |
| Manbagas Island | Biak Numfor | 0.00 km² | — | — |
| Mandena Island | Yapen Islands | 0.00 km² | — | — |
| Manderi Baba Island | Teluk Wondama | 0.05 km² | — | — |
| Manderi Katu Island | Teluk Wondama | 0.03 km² | — | — |
| Mandidenef Fadu Island | Raja Ampat | 0.01 km² | — | — |
| Mandidenef Island | Raja Ampat | 0.06 km² | — | — |
| Mandidenef Mgun Island | Raja Ampat | 0.00 km² | — | — |
| Mandirwar Island | Teluk Wondama | 0.00 km² | — | — |
| Mandui Island | Yapen Islands | 0.00 km² | — | — |
| Mandundi Island | Supiori | 0.00 km² | — | — |
| Mandupi Island | Teluk Wondama | 0.00 km² | — | — |
| Manem Island | Biak Numfor | 0.32 km² | — | 1 m |
| Mang Mwarmar Island | Tanimbar Islands | 0.00 km² | — | — |
| Mangalamaidi Kwakwa Island | Aru Islands Regency | 0.06 km² | — | — |
| Mangalamaidi Sinnani Island | Aru Islands Regency | 0.20 km² | — | — |
| Mangan Island | Aru Islands Regency | 0.79 km² | — | 26 m |
| Mangan Kecil Island | Aru Islands Regency | 0.05 km² | — | — |
| Mangarguari Island | Aru Islands Regency | 0.00 km² | — | — |
| Mangasar Dabawar Island | Aru Islands Regency | 0.04 km² | — | — |
| Mangasar Mansaup Fat Island | Tanimbar Islands | 0.00 km² | — | — |
| Mangasar Mansaup Sa Island | Tanimbar Islands | 0.00 km² | — | — |
| Mangasar Mansaup Tel Island | Tanimbar Islands | 0.00 km² | — | — |
| Mangasardabawar Janjakai Island | Aru Islands Regency | 0.01 km² | — | — |
| Mangasardabawar Yanyanai Island | Aru Islands Regency | 0.00 km² | — | — |
| Mangau Poje Liu Island | Raja Ampat | 0.00 km² | — | — |
| Mangau Poje Wai Island | Raja Ampat | 0.00 km² | — | — |
| Mangga Island | Aru Islands Regency | 0.18 km² | — | — |
| Mangga Island | Nabire | 0.14 km² | — | — |
| Manggabua Kasun Island | Supiori | 0.00 km² | — | — |
| Manggarna Island | Northern Territory | — | — | 3 m |
| Manggi Island | Fakfak | 0.00 km² | — | — |
| Mangkahani Island | Yapen Islands | 0.01 km² | — | — |
| Mangkinani Island | Raja Ampat | 0.34 km² | — | 17 m |
| Mangkinsus Island | Raja Ampat | 0.61 km² | — | — |
| Mangrove Island | Queensland | — | — | 8 m |
| Mangrove Island | New South Wales | — | — | 4 m |
| Mangrove Island | New South Wales | — | — | 2 m |
| Mangrove Island | New South Wales | — | — | 12 m |
| Mangrove Island | Victoria | — | — | 1 m |
| Mangrove Island | New South Wales | — | — | 8 m |
| Mangrove Island | New South Wales | — | — | 8 m |
| Mangrove Island | New South Wales | — | — | 2 m |
| Mangrove Island | Queensland | — | — | 8 m |
| Mangrove Island | Queensland | — | — | 6 m |
| Mangrove Island | Victoria | — | — | 3 m |
| Mangrove Island | Northland Region | — | — | 4 m |
| Mangrove Islet | Victoria | — | — | 1 m |
| Mangur Island | Tual | 2.59 km² | — | 19 m |
| Mani Island | Indonesia | — | — | 1 m |
| Maniai Island | West Papua | — | — | 6 m |
| Maniari Island | Teluk Wondama | 0.00 km² | — | — |
| Manihiki | Cook Islands | 4 km² | — | 4 m |
| Manikaipopo Atsa Island | Raja Ampat | 0.23 km² | — | — |
| Manikaipopo Fat Island | Raja Ampat | 0.07 km² | — | — |
| Manikaipopo Fit Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Island | Raja Ampat | 0.27 km² | — | — |
| Manikaipopo Lafa Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Lafamaifat Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Lafamailu Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Lafamaisa Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Lafamaitol Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Lafamaiwonom Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Lim Island | Raja Ampat | 0.04 km² | — | — |
| Manikaipopo Lu Island | Raja Ampat | 0.06 km² | — | — |
| Manikaipopo Si Island | Raja Ampat | 0.04 km² | — | — |
| Manikaipopo Tol Island | Raja Ampat | 0.05 km² | — | — |
| Manikaipopo Wal Island | Raja Ampat | 0.01 km² | — | — |
| Manikaipopo Wonom Island | Raja Ampat | 0.02 km² | — | — |
| Maniknusa Besar Island | Fakfak | 0.01 km² | — | — |
| Maniknusa Kecil Island | Fakfak | 0.00 km² | — | — |
| Manimaje Island | Nabire | 0.29 km² | — | 1 m |
| Maningker Island | Raja Ampat | 0.00 km² | — | — |
| Manir Island | Southeast Maluku | 4.64 km² | — | 48 m |
| Manisrui Island | Supiori | 0.01 km² | — | — |
| Mankawar Mansaup Fat Island | Tanimbar Islands | 0.00 km² | — | — |
| Mankawar Mansaup Nem Island | Tanimbar Islands | 0.00 km² | — | — |
| Mankawar Mansaup Sa Island | Tanimbar Islands | 0.00 km² | — | — |
| Mankawar Mansaup Tel Island | Tanimbar Islands | 0.00 km² | — | — |
| Mankawar Mansaup Wal Island | Tanimbar Islands | 0.00 km² | — | — |
| Manley Island | Queensland | — | — | 14 m |
| Manmutahiniyef Island | Raja Ampat | 0.02 km² | — | — |
| Manmutahiniyef Island | Raja Ampat | 0.02 km² | — | — |
| Manmutahiniyef Lol Island | Raja Ampat | 0.00 km² | — | — |
| Manono Island | Aiga-i-le-Tai | 2.90 km² | 889 | 67 m |
| Manorom Island | Raja Ampat | 7.52 km² | — | 274 m |
| Manowar Island | Queensland | 4.35 km² | — | — |
| Manra Island | Phoenix Islands | 4.40 km² | 0 | — |
| Manrumin Island | Aru Islands Regency | 0.10 km² | — | — |
| Mansari Island | Supiori | 0.00 km² | — | — |
| Mansawan Island | Raja Ampat | 0.02 km² | — | — |
| Mansell Island | Queensland | — | — | 165 m |
| Manselo Island | Raja Ampat | 0.01 km² | — | — |
| Mansinam Island | Manokwari | 4.05 km² | — | 37 m |
| Mansinem Iba Island | Raja Ampat | 0.00 km² | — | — |
| Mansinem Island | Teluk Wondama | 0.15 km² | — | — |
| Mansinem Island | Teluk Wondama | 0.15 km² | — | — |
| Mansinem Island | Raja Ampat | 0.00 km² | — | — |
| Mansinem Mgun Island | Raja Ampat | 0.00 km² | — | — |
| Mansorom Island | Supiori | 0.09 km² | — | — |
| Mansuar Island | Raja Ampat | 14.1 km² | 539 | 184 m |
| Mansurbabo Island | Biak Numfor | 0.02 km² | — | — |
| Mansurbabo Island | Supiori | 0.02 km² | — | — |
| Manta Ray Island | Queensland | — | — | 7 m |
| Mantai Batulai Island | Aru Islands Regency | 0.00 km² | — | — |
| Mantobi Island | Raja Ampat | 0.35 km² | — | 20 m |
| Mantzos Island | New South Wales | — | — | 2 m |
| Manuae Atoll | Cook Islands | — | — | 1 m |
| Manufarayaf Island | Yapen Islands | 2.92 km² | — | 46 m |
| Manuk | Central Maluku | 1.12 km² | 0 | 282 m |
| Manuk Island | Tanimbar Islands | 0.03 km² | — | — |
| Manuka Island | Hurunui District | — | — | 242 m |
| Manuka Island | Clutha District | — | — | 8 m |
| Manukang Island | Central Maluku | 0.07 km² | — | 64 m |
| Manukapua Island | Auckland Region | 2.50 km² | 0 | — |
| Manuoko Island | Eastern Seram | 49.7 km² | — | 77 m |
| Manuop Island | Teluk Wondama | 0.01 km² | — | — |
| Manupampi Island | Yapen Islands | 7.92 km² | — | 106 m |
| Manupasang Island | Teluk Wondama | 0.23 km² | — | — |
| Manus Island | Manus Province | 1,940 km² | 33,000 | — |
| Manutahi Island | Waikato Region | — | — | 39 m |
| Manwenbesapi Island | Raja Ampat | 0.42 km² | — | — |
| Manyow Island | Sorong | 0.02 km² | — | — |
| Mapi Island | Teluk Wondama | 0.07 km² | — | — |
| Mapunlo Island | Raja Ampat | 0.10 km² | — | — |
| Mar Island | Aru Islands Regency | 0.01 km² | — | — |
| Maraboi Island | Fakfak | 0.01 km² | — | — |
| Maraef Barat Island | Fakfak | 0.00 km² | — | — |
| Maraef Timur Island | Fakfak | 0.00 km² | — | — |
| Marakei | Gilbert Islands | 14.1 km² | 2,872 | 3 m |
| Maranggi Island | Teluk Wondama | 0.00 km² | — | — |
| Marasabadi Island | Teluk Wondama | 5.34 km² | — | 31 m |
| Marble Island | Queensland | — | — | 90 m |
| March Island | Tasmania | — | — | 674 m |
| Marchinbar Island | East Arnhem Region | — | — | 50 m |
| Mardanaingura Island | Northern Territory | — | — | 5 m |
| Mardoksarwak Island | Southeast Maluku | 0.05 km² | — | — |
| Marfui Island | Aru Islands Regency | 0.01 km² | — | — |
| Margaret Island | Queensland | 4.63 km² | — | — |
| Margwan Island | Aru Islands Regency | 0.08 km² | — | — |
| Margwari Island | Aru Islands Regency | 0.00 km² | — | — |
| Maria Island | Glamorgan Spring Bay Council | 115.5 km² | 0 | 124 m |
| Maria Island | Northern Territory | — | — | 9 m |
| Maria Island | Auckland Region | — | — | 30 m |
| Maribupui Island | Teluk Wondama | 0.00 km² | — | — |
| Marikanoha Island | Fakfak | 0.00 km² | — | — |
| Marikiob Island | Supiori | 0.00 km² | — | — |
| Marina Malor Island | Aru Islands Regency | 0.04 km² | — | — |
| Marinnan Island | Northern Territory | — | — | 5 m |
| Mariri Island | Aru Islands Regency | 2.68 km² | — | 14 m |
| Marjil Island | Aru Islands Regency | 0.15 km² | — | — |
| Marjurin Island | Aru Islands Regency | 0.10 km² | — | — |
| Marjurin Jirjirlai Island | Aru Islands Regency | 0.03 km² | — | — |
| Marlau Island | Eastern Seram | 0.20 km² | — | 13 m |
| Marpot Island | Aru Islands Regency | 2.93 km² | — | — |
| Marquis Island | Queensland | — | — | 23 m |
| Marriott Island | Northland Region | — | — | 62 m |
| Marsela Island | Southwest Maluku | 45.4 km² | — | — |
| Marsh Island | Tasmania | — | — | 1 m |
| Marshall Island | Queensland | — | — | 65 m |
| Marshall Islands | German New Guinea | 181.4 km² | 53,127 | — |
| Marsian Island | Aru Islands Regency | 0.75 km² | — | — |
| Martaporan Island | Aru Islands Regency | 0.24 km² | — | — |
| Marte Island | Queensland | — | — | 7 m |
| Martin Island | New South Wales | — | — | 4 m |
| Martin Islet | Queensland | — | — | 8 m |
| Martins Island | Victoria | — | — | 16 m |
| Maru Island | Tanimbar Islands | 23.3 km² | — | 79 m |
| Marua Island | Nabire | 0.02 km² | — | — |
| Marum Island | South Australia | — | — | 9 m |
| Marwatu Island | Eastern Seram | 0.00 km² | — | 5 m |
| Mary Edwards Island | New South Wales | — | — | 33 m |
| Mary Island | Southland District | — | — | 363 m |
| Marys Island | Tasmania | — | — | 404 m |
| Mas Island | Tual | 0.00 km² | — | — |
| Mas Mili Island | Sorong | 0.00 km² | — | — |
| Masangarat Island | Eastern Seram | 0.00 km² | — | — |
| Masangarat Island | Eastern Seram | 0.00 km² | — | — |
| Masigi Island | Raja Ampat | 1.20 km² | — | — |
| Masillon Island | South Australia | — | — | 54 m |
| Masimasi Island | Sarmi | 0.78 km² | — | — |
| Massacre Island | New South Wales | — | — | 152 m |
| Massig | Queensland | — | — | 9 m |
| Masthead Island | Queensland | — | — | 16 m |
| Masular Island | Southeast Maluku | 0.00 km² | — | — |
| Masun Island | Teluk Wondama | 0.00 km² | — | — |
| Mata Natuk Island | Fakfak | 0.00 km² | — | — |
| Mata Nenem Island | Fakfak | 0.01 km² | — | — |
| Matabola Island | Aru Islands Regency | 0.07 km² | — | — |
| Matagi Island | Cakaudrove | 0.97 km² | — | 50 m |
| Matai Island | Aru Islands Regency | 0.02 km² | — | — |
| Mataifanan Island | Aru Islands Regency | 0.03 km² | — | — |
| Matakana Island | Western Bay of Plenty District | 60 km² | 244 | 70 m |
| Matakus Island | Tanimbar Islands | 4.69 km² | — | 17 m |
| Matan Island | Raja Ampat | 0.04 km² | — | 32 m |
| Matapara / Pickersgill Island | Marlborough District | 0.96 km² | — | 186 m |
| Matapia | Far North District | 0.03 km² | 0 | — |
| Matas Island | Teluk Wondama | 0.06 km² | — | — |
| Matatujuh Island | Aru Islands Regency | 0.60 km² | — | — |
| Matauli Island | Eastern Seram | 0.00 km² | — | — |
| Matauli Island | Eastern Seram | 0.00 km² | — | — |
| Mataura Island | Southland District | — | — | 10 m |
| Matawane | New South Wales | — | — | 39 m |
| Mate Atsa Island | Raja Ampat | 0.01 km² | — | — |
| Mate Fat Island | Raja Ampat | 0.00 km² | — | — |
| Mate Ganan Island | Raja Ampat | 0.22 km² | — | — |
| Mate Lim Island | Raja Ampat | 0.00 km² | — | — |
| Mate Lu Island | Raja Ampat | 0.00 km² | — | — |
| Mate Pale Island | Raja Ampat | 0.41 km² | — | 85 m |
| Mate Tol Island | Raja Ampat | 0.00 km² | — | — |
| Matekapatcol Island | Raja Ampat | 0.04 km² | — | — |
| Matekuri Island | Waikato Region | — | — | 201 m |
| Matheison Island | New South Wales | — | — | 1 m |
| Mathieson Island | New South Wales | — | — | 1 m |
| Mati Island | Aru Islands Regency | 0.01 km² | — | — |
| Matiu / Somes Island | Wellington City | 0.25 km² | — | — |
| Matmalas Island | Eastern Seram | 0.00 km² | — | — |
| Matmutmulkario Island | Raja Ampat | 0.00 km² | — | — |
| Matnana Island | Fakfak | 0.01 km² | — | — |
| Mattawunga | New South Wales | — | — | 39 m |
| Matte Kalanwuy Island | Raja Ampat | 0.00 km² | — | — |
| Matte Yef Kacano Island | Raja Ampat | 0.00 km² | — | — |
| Matuku Island | Moala Islands | 57 km² | — | 385 m |
| Matuturo Island | Fakfak | 0.01 km² | — | — |
| Mau Island | Raja Ampat | 0.00 km² | — | — |
| Mauduarasifu Island | Tanimbar Islands | 0.27 km² | — | — |
| Maugal Fatufufin Island | Aru Islands Regency | 0.03 km² | — | — |
| Maukiekie Island | Otago Region | — | — | 46 m |
| Maunyosol Island | Raja Ampat | 0.00 km² | — | — |
| Mavala Island | Raja Ampat | 0.02 km² | — | — |
| Mavourneen Rocks | Tasmania | — | — | 1 m |
| Mavéa | Sanma | 47 km² | — | 63 m |
| Mawampi Island | Yapen Islands | 0.02 km² | — | — |
| Mawampondi Island | Supiori | 0.00 km² | — | — |
| Mawoni Island | Supiori | 0.00 km² | — | — |
| Mayef Island | Raja Ampat | 2.76 km² | — | 191 m |
| Mayepunuk Island | Raja Ampat | 0.06 km² | — | — |
| Mayo Island | Central Otago District | — | — | 69 m |
| Mayor Island / Tūhua | Bay of Plenty Region | 13 km² | 3 | 355 m |
| Mboriktiget Island | Fakfak | 0.00 km² | — | — |
| McAuliffs Island | Victoria | — | — | 2 m |
| McCluer Island | Northern Territory | — | — | 23 m |
| Mcdonald Island | Victoria | — | — | 260 m |
| Mcevoy Island | New South Wales | — | — | 902 m |
| McEwen Island | Queensland | — | — | 9 m |
| Mcgearys Island | New South Wales | — | — | 18 m |
| Mcgoughs Island | New South Wales | — | — | 2 m |
| McGraths Island | New South Wales | — | — | 30 m |
| McHaffies Reef | Victoria | — | — | 16 m |
| McHugh Island | Victoria | — | — | 48 m |
| McKean Island | Phoenix Islands | 0.57 km² | 0 | 5 m |
| McNamara Island | Northern Territory | — | — | 20 m |
| Mcqueens Island | New South Wales | — | — | 773 m |
| Meck Island | Kwajalein Atoll | 0.22 km² | 0 | 11 m |
| Meddler Island | Queensland | — | — | 9 m |
| Medea Island | South Australia | — | — | 18 m |
| Media Island | South Australia | — | — | 18 m |
| Mehil Island | Sorong | 0.02 km² | — | — |
| Meirang Island | Aru Islands Regency | 1.40 km² | — | 19 m |
| Meirera Besar Island | Aru Islands Regency | 0.00 km² | — | — |
| Mejit Island | Marshall Islands | 1.86 km² | 348 | — |
| Meladawan Island | Tanimbar Islands | 0.11 km² | — | — |
| Melapo Island | Raja Ampat | 2.00 km² | — | 182 m |
| Mele | Shefa | — | — | 1 m |
| Mellicks Island | Queensland | — | — | 13 m |
| Mellor Island | South Australia | — | — | 1 m |
| Melsuput Island | Raja Ampat | 0.13 km² | — | 18 m |
| Melville Island | Northern Territory | 5,765 km² | 1,030 | 43 m |
| Memaubro Island | Raja Ampat | 0.03 km² | — | — |
| Membok Island | Sorong | 0.01 km² | — | 1 m |
| Memel | New South Wales | — | — | 1 m |
| Memorial Rock | Tasmania | — | — | 13 m |
| Mengge Island | Sarmi | 0.12 km² | — | — |
| Menlau Island | Aru Islands Regency | 0.15 km² | — | 17 m |
| Menonket Barat Island | Sorong | 0.33 km² | — | — |
| Menonket Tengah Island | Sorong | 0.01 km² | — | — |
| Menonket Timur Island | Sorong | 0.05 km² | — | — |
| Mensyane Island | Jayapura | 0.00 km² | — | — |
| Meos Abay | Raja Ampat | 0.01 km² | — | — |
| Meos Aitapor | Raja Ampat | 0.00 km² | — | — |
| Meos Ampui | Raja Ampat | 0.00 km² | — | — |
| Meos Aroret Bonday | Raja Ampat | 0.00 km² | — | — |
| Meos Aroret Fandu | Raja Ampat | 0.00 km² | — | — |
| Meos Aroret Munde | Raja Ampat | 0.00 km² | — | — |
| Meos Arwaf Iboer | Raja Ampat | 0.01 km² | — | — |
| Meos Awawebyar Kampung | Raja Ampat | 0.02 km² | — | — |
| Meos Awawebyar Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Awawebyar Wambarek | Raja Ampat | 0.00 km² | — | — |
| Meos Awawebyar Wamurem | Raja Ampat | 0.01 km² | — | — |
| Meos Awyau | Raja Ampat | 0.01 km² | — | — |
| Meos Bakon Bonday | Raja Ampat | 0.00 km² | — | — |
| Meos Bakon Iba | Raja Ampat | 0.01 km² | — | — |
| Meos Bakon Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Bakon Munde | Raja Ampat | 0.00 km² | — | — |
| Meos Bakon Mundi | Raja Ampat | 0.00 km² | — | — |
| Meos Beba | Teluk Wondama | 0.44 km² | — | — |
| Meos Buek Bonday | Raja Ampat | 0.00 km² | — | — |
| Meos Buek Iba | Raja Ampat | 0.01 km² | — | — |
| Meos Buek Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Bun Iba | Raja Ampat | 0.21 km² | — | — |
| Meos Bun Mkun | Raja Ampat | 0.06 km² | — | — |
| Meos Dore Intarwaim | Raja Ampat | 0.01 km² | — | — |
| Meos Fanfan Mon Iba | Raja Ampat | 0.01 km² | — | — |
| Meos Fanfan Mon Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Ikar | Raja Ampat | 0.00 km² | — | — |
| Meos Imbekanaek Wambrayew | Raja Ampat | 0.00 km² | — | — |
| Meos Imbekanaek Wambruyer | Raja Ampat | 0.00 km² | — | — |
| Meos Imbyuwer | Raja Ampat | 0.00 km² | — | — |
| Meos Imuk Bonday | Raja Ampat | 0.00 km² | — | — |
| Meos Imuk Munde | Raja Ampat | 0.00 km² | — | — |
| Meos Inarpyai | Raja Ampat | 0.01 km² | — | — |
| Meos Inaw Iba | Raja Ampat | 0.01 km² | — | — |
| Meos Inaw Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Inaw Munde | Raja Ampat | 0.00 km² | — | — |
| Meos Inbedok | Raja Ampat | 0.00 km² | — | — |
| Meos Indwaf | Raja Ampat | 0.00 km² | — | — |
| Meos Injaka Iba | Raja Ampat | 0.00 km² | — | — |
| Meos Injaka Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Insoer Iba | Raja Ampat | 0.00 km² | — | — |
| Meos Insur | Raja Ampat | 0.00 km² | — | — |
| Meos Introm | Raja Ampat | 0.00 km² | — | — |
| Meos Kaibam Iba | Raja Ampat | 0.01 km² | — | — |
| Meos Kaibam Munde | Raja Ampat | 0.01 km² | — | — |
| Meos Kangkum | Raja Ampat | 0.01 km² | — | — |
| Meos Kerufik | Raja Ampat | 0.00 km² | — | — |
| Meos Kinaktapor Iba | Raja Ampat | 0.00 km² | — | — |
| Meos Kinaktapor Mundi | Raja Ampat | 0.00 km² | — | — |
| Meos Kor Weter | Raja Ampat | 0.00 km² | — | — |
| Meos Mambefat | Raja Ampat | 0.00 km² | — | — |
| Meos Mambenu | Raja Ampat | 0.00 km² | — | — |
| Meos Mandawan | Raja Ampat | 0.01 km² | — | — |
| Meos Mangkawwa | Raja Ampat | 0.01 km² | — | — |
| Meos Mangkringkring | Raja Ampat | 0.00 km² | — | — |
| Meos Mantorom Bonday | Raja Ampat | 0.00 km² | — | — |
| Meos Mantorom Munde | Raja Ampat | 0.00 km² | — | — |
| Meos Mon Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Mondap Iba | Raja Ampat | 0.03 km² | — | — |
| Meos Mondap Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Nikanor | Raja Ampat | 0.00 km² | — | — |
| Meos Nyampun Abui | Raja Ampat | 0.00 km² | — | — |
| Meos Parem | Raja Ampat | 0.00 km² | — | — |
| Meos Paru Iba | Raja Ampat | 0.00 km² | — | — |
| Meos Paru Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Rabon Iba | Raja Ampat | 0.02 km² | — | — |
| Meos Rabon Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Ranso | Raja Ampat | 0.01 km² | — | — |
| Meos Rebit | Raja Ampat | 0.00 km² | — | — |
| Meos Tabitatu Iba | Raja Ampat | 0.00 km² | — | — |
| Meos Tabitatu Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Tawparanadi Bonday | Raja Ampat | 0.00 km² | — | — |
| Meos Tawparanadi Fandu | Raja Ampat | 0.00 km² | — | — |
| Meos Tawparanadi Mkun | Raja Ampat | 0.00 km² | — | — |
| Meos Tawparanadi Munde | Raja Ampat | 0.00 km² | — | — |
| Meos Trai | Raja Ampat | 0.18 km² | — | — |
| Meos Trai Weter | Raja Ampat | 0.00 km² | — | — |
| Meos Urai Bonde | Raja Ampat | 0.04 km² | — | — |
| Meos Urai Mkun | Raja Ampat | 0.05 km² | — | — |
| Meos Waimun | Raja Ampat | 0.01 km² | — | — |
| Meos War Manak | Raja Ampat | 0.01 km² | — | — |
| Meos Yar Mar | Raja Ampat | 0.00 km² | — | — |
| Mercury Islands | Waikato Region | 17.2 km² | — | — |
| Merelava | Torba | 18 km² | 647 | 1,028 m |
| Meridan Island | Victoria | — | — | 198 m |
| Merig | Torba | 0.50 km² | 12 | 3 m |
| Meringa Island | Northern Territory | — | — | 17 m |
| Merino Island | New South Wales | — | — | 1,180 m |
| Merir | Sonsorol | 0.90 km² | 5 | — |
| Mernusa Island | Fakfak | 0.00 km² | — | — |
| Merries Reef | New South Wales | — | — | 4 m |
| Merun Island | Aru Islands Regency | 0.00 km² | — | — |
| Mervyn Island | Southland Region | — | — | 1,528 m |
| Mesas Island | Tanimbar Islands | 0.06 km² | — | — |
| Mesellu Ganan Island | Raja Ampat | 0.07 km² | — | 16 m |
| Mesellu Pale Island | Raja Ampat | 0.22 km² | — | 33 m |
| Mesemta | West Papua | — | — | 5 m |
| Mesemta Kapatcol Tolanamganam Island | Raja Ampat | 0.00 km² | — | — |
| Mesemtani Kapatcol Island | Raja Ampat | 0.00 km² | — | — |
| Mesemtani Nikapatcol Ganam Island | Raja Ampat | 0.00 km² | — | — |
| Mesenllu Ganan Island | Raja Ampat | 0.07 km² | — | 13 m |
| Mesenllu Pale Island | Raja Ampat | 0.11 km² | — | — |
| Met Island | Raja Ampat | 0.01 km² | — | — |
| Meth Islet | Queensland | — | — | 8 m |
| Meti Meti | West Papua | — | — | 260 m |
| Metoma | Torba | 3 km² | 13 | — |
| Metotoi Island | Aru Islands Regency | 0.03 km² | — | — |
| Metureby Island | Jayapura | 0.01 km² | — | — |
| Meuhu Island | Southeast Maluku | 0.02 km² | — | — |
| Mewstone | Tasmania | — | — | 150 m |
| Mexican Hat | South Australia | — | — | 3 m |
| Mgasai Island | Supiori | 0.01 km² | — | — |
| Miall Island | Queensland | — | — | 24 m |
| Micalo Island | New South Wales | — | 45 | 3 m |
| Mid Molle Island | Queensland | — | — | 34 m |
| Middle Bank | New South Wales | — | — | 1 m |
| Middle Cay | Queensland | — | — | 4 m |
| Middle Island | Victoria | 2 km² | — | — |
| Middle Island | South Australia | — | — | 29 m |
| Middle Island | Queensland | — | — | 6 m |
| Middle Island | Queensland | — | — | 16 m |
| Middle Island | Queensland | — | — | 154 m |
| Middle Island | Queensland | — | — | 46 m |
| Middle Island | Queensland | — | — | 19 m |
| Middle Island | New South Wales | — | — | 4 m |
| Midge Island | Queensland | — | — | 16 m |
| Midge Island | New South Wales | — | — | 9 m |
| Midgy Gharrat Island | New South Wales | — | — | 2 m |
| Mile Island | Tasmania | 4 km² | — | — |
| Miles Island | Northern Territory | — | — | 19 m |
| Milford Island | Far North District | — | — | 9 m |
| Mili Atoll | Marshall Islands | 14.9 km² | — | 3 m |
| Milibundurra Island | Northern Territory | — | — | 3 m |
| Millingimbi Island | Northern Territory | — | — | 15 m |
| Mills Island | New South Wales | — | — | 6 m |
| Milmalet Island | Aru Islands Regency | 0.00 km² | — | — |
| Milman Islet | Queensland | — | — | 14 m |
| Milmil | New South Wales | — | — | 1 m |
| Milne Island | South Australia | — | — | 13 m |
| Milson Island | New South Wales | — | — | 39 m |
| Milyema Island | Northern Territory | — | — | 17 m |
| Mimi Islet | Queensland | 0.11 km² | 0 | 14 m |
| Mimo Island | Fakfak | 0.01 km² | — | — |
| Mine Island | Queensland | — | — | 29 m |
| Miniwirkaryo Island | Teluk Wondama | 0.00 km² | — | — |
| Minlo Island | Sorong | 0.01 km² | — | 17 m |
| Minster Island | Queensland | — | — | 105 m |
| Minulo Butle Island | Raja Ampat | 0.11 km² | — | — |
| Minyaifun Island | Raja Ampat | 7.26 km² | — | 35 m |
| Mioko Island | East New Britain Province | 1.30 km² | — | — |
| Mios | Papua | — | — | 109 m |
| Mios Abyab | Biak Numfor | 0.00 km² | — | — |
| Mios Aiwan | Raja Ampat | — | — | 9 m |
| Mios Arwai | Supiori | 0.03 km² | — | — |
| Mios Aviak | Biak Numfor | 0.01 km² | — | — |
| Mios Beba | Supiori | 0.02 km² | — | — |
| Mios Bebur | Supiori | 0.01 km² | — | — |
| Mios Bekor | Raja Ampat | — | — | 8 m |
| Mios Bekwan | Raja Ampat | — | — | 9 m |
| Mios Bendi | Supiori | 0.02 km² | — | — |
| Mios Bepampam Beba | Supiori | 0.01 km² | — | — |
| Mios Bepampam Fadu | Supiori | 0.01 km² | — | — |
| Mios Bepampam Kasun | Supiori | 0.00 km² | — | — |
| Mios Beprefi | Supiori | 0.00 km² | — | — |
| Mios Besyom Eser | Supiori | 0.00 km² | — | — |
| Mios Dafi | Biak Numfor | 0.00 km² | — | — |
| Mios Fuar | Biak Numfor | 0.00 km² | — | — |
| Mios Kapaf Oser | Biak Numfor | 0.00 km² | — | — |
| Mios Kapaf Suru | Biak Numfor | 0.00 km² | — | — |
| Mios Kapapu | Supiori | 0.02 km² | — | — |
| Mios Kapar | Biak Numfor | 0.00 km² | — | — |
| Mios Karwar | Raja Ampat | — | — | 2 m |
| Mios Koerweter | Raja Ampat | — | — | 19 m |
| Mios Kredori | Supiori | 0.01 km² | — | — |
| Mios Kri | Indonesia | — | — | 29 m |
| Mios Mandun | Supiori | 0.01 km² | — | — |
| Mios Mandun | Supiori | 0.00 km² | — | — |
| Mios Mangguandi | Biak Numfor | 5.65 km² | — | 14 m |
| Mios Mansaro | Supiori | 0.00 km² | — | — |
| Mios Maondi | Supiori | 0.01 km² | — | — |
| Mios Mawa | Supiori | 0.03 km² | — | — |
| Mios Mraf Beba | Supiori | 0.01 km² | — | — |
| Mios Mrap Beba | Supiori | 0.00 km² | — | — |
| Mios Mrap Kasun | Supiori | 0.01 km² | — | — |
| Mios Muri | Supiori | 1.07 km² | — | 1 m |
| Mios Pondi | Supiori | 0.71 km² | — | 29 m |
| Mios Rar | Raja Ampat | — | — | 7 m |
| Mios Ros | Raja Ampat | — | — | 7 m |
| Mios Rumbopiar | Raja Ampat | — | — | 12 m |