Liar could refer to:
- Truth and Lies: An index of tropes contrasting honest people and deceptive people.
- "The Liar (folktale)", a traditional folktale of Armenia.
- "Liar! (1941)", a Short Story by Isaac Asimov.
- The Liar (novel) (1991), a novel by Stephen Fry.
- Liar Liar (1997), a film directed by Tom Shadyac.
- Liar (2009), a novel by Justine Larbalestier.
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