Flatlander may refer to:
- A character in the 1884 Edwin Abbott novella Flatland
- Flatlander (story), a 1967 story by Larry Niven
- Flatlander (short story collection), a 1975 collection of short stories by Larry Niven
- The Flatlanders, a country music band
- Andy "Flatlander" Morin, a producer and keyboardist for the experimental hip hop group Death Grips