Jean O'Leary, American nun and activist (d. 2005)
Jean O'Leary (March 4, 1948 – June 4, 2005) was an American lesbian and gay rights activist. She was the founder of Lesbian Feminist Liberation, one of the first lesbian activist groups in the women's movement, and an early member and co-director of the National Gay and Lesbian Task Force. She co-founded National Coming Out Day.

Before becoming a lesbian and gay rights activist , she was a Roman Catholic religious sister. She would later write about her experience in a 1985 anthology, Lesbian Nuns: Breaking Silence.