Mordecai Richler (January 27, 1931 – July 3, 2001) was a Canadian writer. His best-known works include The Apprenticeship of Duddy Kravitz (1959) and Barney's Version (1997). His 1970 novel St. Urbain's Horseman and 1989 novel Solomon Gursky Was Here were nominated for the Booker Prize.

He is also well known for the Jacob Two-Two fantasy series for children. In addition to his fiction, Richler wrote numerous essays about the Jewish community in Canada, and about Canadian and Quebec nationalism. One of his works, Oh Canada! Oh Quebec! (1992), a collection of essays about nationalism and anti-Semitism, generated considerable controversy.

Richler was born into a working-class Jewish background in Montreal, where he learned Yiddish and English. He graduated from Baron Byng High School and briefly attended Sir George Williams College (now Concordia University) to study English before leaving to pursue his writing career.