Susan Brownmiller (born Susan Warhaftig, February 15, 1935) is an American journalist, author, and feminist activist. She is best known for her 1975 book Against Our Will: Men, Women, and Rape, which was selected by The New York Public Library as one of the 100 most important books of the 20th century.

Brownmiller participated in civil rights activism, joining CORE and SNCC during the sit-in movement and volunteering for Freedom Summer in 1964, wherein she worked on voter registration in Meridian, Mississippi. Returning to New York, she began writing for The Village Voice and became a network TV newswriter at the American Broadcasting Company, a job she held until 1968.

She first became involved in the Women's Liberation Movement in New York City in 1968 by joining a consciousness-raising group in the newly formed New York Radical Women organization. Brownmiller went on to coordinate a sit-in.