 Feminism is said to be the movement to end women’s oppression (hooks 2000, 26). One possible way to understand ‘woman’ in this claim is to take it as a sex term: ‘woman’ picks out human females and being a human female depends on various biological and anatomical features (like genitalia). Historically many feminists have understood ‘woman’ differently: not as a sex term, but as a gender term that depends on social and cultural factors (like social position). In so doing, they distinguished sex (being female or male) from gender (being a woman or a man), although most ordinary language users appear to treat the two interchangeably. In feminist philosophy, this distinction has generated a lively debate. Central questions include: What does it mean for gender to be distinct from sex, if anything at all? How should we understand the claim that gender depends on social and/or cultural factors? What does it mean to be gendered woman, man, or genderqueer? This entry outlines and discusses distinctly feminist debates on sex and gender considering both historical and more contemporary positions.