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- Tabor Island: from Jules Verne's novel In Search of the Castaways
- Tanetane Island: an island in the video game Mother 3
- Tatsumiya Island: from Fafner of the Azure
- Telv Uljamue Floating Islands: the islands that held Zurrchu Eamda's base that was destroyed by Caleb Hill in the New Era series
- The Island: The Island that the survivors of Oceanic Flight 815 crash on in LOST
- The Isles of Syren: The islands on which Septimus, Jenna, and Beetle are trapped on when Spit Fyre breaks his tail in Septimus Heap book five: Syren
- Tinda Lau: an island in the South Pacific, northeast of Australia, featured in the daytime soap opera Days of our Lives
- Tingle Island: home of Tingle in the Nintendo Gamecube Game The Legend of Zelda: The Wind Waker
- Themyscira: in the Wonder Woman comics.
- Todday Island: a Hebridean island featured in the 1949 film Whisky Galore!. It combined the two islands, Great Todday and Little Todday, from the original novel by Compton Mackenzie.
- Tom Sawyer's Island: the island in the Mississippi River on which Tom Sawyer and Huck Finn live for a few days in The Adventures of Tom Sawyer
- Tracy Island: an island in the TV series Thunderbirds
- Treasure Island: the island from the classic novel by Robert Louis Stevenson. The map of the island in the book is probably based on Unst in Shetland, which Stevenson visited.
- Tsalal: an island in the novel The Narrative of Arthur Gordon Pym by Edgar Allan Poe and its sequel An Antarctic Mystery by Jules Verne
Read more about this topic: List Of Fictional Islands