Helen Taylor (1831–1907) was an English feminist, socialist, and prominent advocate for women's suffrage. She was the daughter of Harriet Taylor Mill and the stepdaughter of John Stuart Mill. After her mother's death, she dedicated herself to being Mill’s confidante, intellectual partner, and editor, a role she performed until his death in 1873. Her contributions to Mill’s work were immense; she was not merely a secretary but an active co-author and intellectual collaborator, helping to shape his most important philosophical works.
Beyond her work with Mill, Taylor was a significant political and social activist in her own right. She became a leading figure in the women’s suffrage movement, tirelessly campaigning for women's right to vote. She also advocated for compulsory education and various social reforms. Often overshadowed by the men in her life, Helen Taylor was a brilliant thinker and a courageous activist who played a crucial, though often uncredited, role in the history of feminism and political thought. Her own intellectual contributions and unwavering dedication to social justice make her a remarkable figure in history.