Warren Frost (born 25 May 1929) is an American actor. His work has mainly been in the theatre, but has worked in movie and television sporadically since 1958. He is known for roles in Twin Peaks, Matlock, and Seinfeld. He is the father of novelist, television screenwriter, and producer Mark Frost, actress Lindsay Frost and writer Scott Frost.

Born and raised in upstate Vermont, Warren Frost left home at age 17 to enlist in the U.S. Navy during World War II. After his service, he worked mainly in theater. He has a doctorate in theater arts from the University of Minnesota and a published playwright with four plays to his credit and has writen a novel.