Isiah Whitlock Jr. (born September 13, 1954) is an American actor. He is best known for his role as corrupt state senator Clay Davis on the HBO television series The Wire as well as being a frequent collaborator of Spike Lee.

He has also appeared in films including Goodfellas, Pieces of April, 1408, Enchanted, Cedar Rapids, Pete’s Dragon, Cars 3, The Old Man and the Gun, All Square, I Care a Lot, and Lightyear and television series including The Good Cop, Veep, Chappelle's Show, Your Honor, and several roles across installments of the Law & Order franchise.

Early life
Whitlock was born in South Bend, Indiana. He attended college at Southwest Minnesota State University in Marshall, Minnesota, where he enrolled through a football scholarship and studied theater. Injuries led him to stop playing football and focus on acting. After graduating in 1976, he moved to San Francisco and joined the American Conservatory Theater.