Katherine Warren was an American film and television actress. She is best known for her roles in the 1949 film All the King's Men, the 1951 film The Prowler, and the 1954 film The Caine Mutiny.

All the King's Men is a 1949 American political drama film written, produced, and directed by Robert Rossen. It is based on Robert Penn Warren's Pulitzer Prize-winning 1946 novel of the same name. It stars Broderick Crawford, John Ireland, Mercedes McCambridge, and Joanne Dru. The film centers on the rise and fall of an idealistic-but-ruthless politician in the American South, patterned after Louisiana Governor Huey Long.