Ti-Grace Atkinson is an American radical feminist author and activist who was a prominent figure in the second-wave feminist movement. She was an early member of the National Organization for Women (NOW), serving on its national board and as the president of the New York chapter. After leaving NOW in 1968 due to ideological differences, she co-founded the more radical group The Feminists. Her influential work, particularly her book 'Amazon Odyssey,' critiques patriarchal institutions and advocates for the political separation of women from men.