Liar Liar is a 1997 American fantasy comedy film directed by Tom Shadyac and written by Paul Guay and Stephen Mazur. It stars Jim Carrey as a lawyer who built his entire career on lying but finds himself cursed to speak only the truth for a single day, during which he struggles to maintain his career and to reconcile with his ex-wife and son whom he alienated with his pathological lying.

The film is the second of three collaborations between Carrey and Shadyac—the first being Ace Ventura: Pet Detective and the third being Bruce Almighty—the second of three collaborations between Guay and Mazur—the others being The Little Rascals and Heartbreakers—and the first of three collaborations between Carrey and producer Brian Grazer, the other two being How the Grinch Stole Christmas (2000) and Fun with Dick and Jane (2005).

The film was released to critical and commercial success, grossing $302.7 million against a budget of $45 million and earning positive reviews from critics and audiences, who particularly praised Carrey's performance. At the 55th Golden Globe Awards, he was nominated for Best Actor in a Motion Picture – Musical or Comedy.