Karen Morley (December 12, 1909 - March 8, 2003) was an American film actress.

Born Mildred Linton in Ottumwa, Iowa, Morley came to prominence in Hollywood films in the early 1930s, most notably in Mata Hari (1931), Scarface (1932), Arsene Lupin (1933), and Dinner at Eight (1934). She was a frequent player in films until the end of the decade, and was married to director Charles Vidor from 1932 until 1943. In 1943 she married the actor Lloyd Gough.

Her career came to an end in 1947, when she testified before the House Un-American Activities Committee and refused to answer questions about her alleged Communist Party membership. She maintained her political activism for the rest of her life, running unsuccessfully for government in 1954, but was never able to rebuild her acting career. She remained married to Gough until his death in 1984, and moved to the San Francisco Bay area late in life. In December 1999, she appeared in the magazine Vanity Fair in an article about blacklist survivors.

She died from pneumonia in Woodland Hills, California.