Leslie Mann (born March 26, 1972) is an American actress.

Mann was born in San Francisco, California, and began her career at the age of 17, with appearances in television commercials. From a field of 500 candidates, Mann was chosen from an open audition for a role in The Cable Guy (1996). She has starred in films such as George of the Jungle, Big Daddy, The 40-Year-Old Virgin and Knocked Up. Mann will reunite with her Cable Guy co-star Jim Carrey in the upcoming film I Love You Phillip Morris, and Big Daddy co-star Adam Sandler in the upcoming film Funny People. Mann is set to star alongside Elizabeth Banks in What Was I Thinking?, based upon the book by Barbara Davilman and Liz Dubelman.

Mann is married to writer-director Judd Apatow, with whom she has two daughters, Iris and Maude. She met Apatow on the set of The Cable Guy (1996), which he produced.