Margaret Ann Lipton (August 30, 1946 – May 11, 2019) was an American actress, model, and singer. She was well known through her role as flower child Julie Barnes in the counterculture television series The Mod Squad (1968–1973), for which she won the Golden Globe Award for Best Actress – Television Series Drama in 1970. Her five-decade television, film, and stage career included many roles, including Norma Jennings in David Lynch's Twin Peaks.
She is also known as Margaret Ann Lipton, Margaret Lipton, Margaret Anne Lipton, Peggy Ann Lipton, Peggy Anne Lipton and Peggy Lipton Jones.
Lipton revealed that she had been diagnosed with colon cancer in 2004 and was being treated for it. On May 11, 2019, she died of the disease in Los Angeles.