Katherine Tupper "Kitty" Winn (born February 21, 1943) is an American actress. She is best known for her roles as the heroin addict Helen in the romantic drama The Panic in Needle Park (1971), for which she won the Best Actress award at the 1971 Cannes Film Festival, and her recurring role of Sharon Spencer in the horror film franchise The Exorcist.

Early life
Kitty Winn was born on February 21, 1943, in Washington, D.C., the daughter of Army officer James J. Winn (1907–1990) and Molly Pender Brown Winn (1912–1997). She had one brother. Winn traveled widely during much of her childhood, having spent time in the United States, England, Germany, China, India, and Japan. Her mother is the stepdaughter of U.S. General of the Army, former US Secretary of State, and former US Secretary of Defense George C. Marshall and daughter of Katherine Tupper Marshall.