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- Magarabee Island : from Island of The Scottish Soldier by Flaherty o'Keefe – (Elite Publishing House Taiwan (2006)
- Mako Island ; A Pacific island off Australia H2O Just Add Water
- Mallet Island: from Devil May Cry
- Maple Island: is an island from MapleStory where beginners start and train before leaving to Victoria Island..
- Mardi archipelago: from Herman Melville's Mardi and a Voyage Thither
- Mata Nui: from Bionicle
- Matool: from Zombi 2
- Mêlée Island: a pirate island in the Caribbean the Monkey Island games, part of the Tri-Island area (governed by Elaine Marley)
- Membata: The Island on Lost that the Oceanic 6 claim to have crashed on.
- Metru Nui: from Bionicle
- Milk Island, a brand of milk frothing accessories for Saeco and Gaggia coffee makers.
- Moahu: island in the Pacific encountered in Patrick O'Brian's novels, The Wine-Dark Sea and The Truelove
- Monsterland / Monster Island: from the Godzilla series
- Muir Island: from Marvel Comics
- Mypos: Greek island homeland of Balki Bartokomous in Perfect Strangers
- Myst: from the adventure computer game Myst
- Mystery Island: an island in Neopia
- Moesko Island: island from The Ring by Gore Verbinski
Read more about this topic: List Of Fictional Islands