Ed Lacy (August 25, 1911 - January 7, 1968), born Leonard S. Zinberg in New York City, was an American writer of crime and detective fiction. His 1957 novel Room to Swing received the 1958 Edgar Award for Best Novel.

Lacy was a member of the League of American Writers, and served on its Keep America Out of War Committee in January 1940 during the period of the Hitler-Stalin pact. He died of a heart attack in Harlem in 1968, at the age of 56.