Sidney Abbott (1937-2015) was an activist for women’s rights, particularly lesbian rights. She was one of the most prominent members of the National Organization for Women.
She joined NOW in 1969 and advocated for the establishing of a task force dedicated to promoting the rights of lesbian women. She later founded the National Gay and Lesbian Task Force, and a nonprofit called Women’s Rights are Human Rights. She wrote the book Sappho Was a Right-on Woman in 1971, which discussed connections between feminism and lesbianism, and was the first nonfiction work to portray female homosexuality in a positive light.