Mary Daly was an American radical feminist philosopher and theologian. Daly, who described herself as a "radical lesbian feminist", taught at the Jesuit-run Boston College for 33 years. Once a practicing Roman Catholic, she had disavowed Christianity by the early 1970s. Daly retired from Boston College in 1999, after violating university policy by refusing to allow male students in her advanced women's studies classes. She allowed male students in her introductory class and privately tutored those who wanted to take advanced classes.

Radical feminism is a perspective within feminism that calls for a radical re-ordering of society in which male supremacy is eliminated in all social and economic contexts, while recognizing that women's experiences are also affected by other social divisions such as in race, class, and sexual orientation. The ideology and movement emerged in the 1960s.