Grant Heslov (born May 15, 1963) is an American actor and Academy Award-nominated film producer and screenwriter. His acting credits include films like True Lies, Dante's Peak, Enemy of the State, The Scorpion King and Good Night, and Good Luck. and several credits in TV series (Family Ties, L.A. Law, Matlock, Sleeper Cell).

Heslov was born in Los Angeles, California. He attended Palos Verdes High School, the University of Southern California (USC) along with friend Tate Donovan, and was a member of Phi Kappa Psi.

He was the Academy Award-nominated producer and screenwriter of Good Night, and Good Luck. Together with George Clooney, he was also nominated for an Oscar for Best Original Screenplay. Heslov also appears in the film as Don Hewitt, the director of the TV series See It Now, around which the movie is centered. On August 2006, he and George Clooney started a movie company, Smoke House.