Zackie Achmat (1962–): South African anti-HIV/AIDS activist; founder of the Treatment Action Campaign.
Baba Amte (1914–2008): Respected Indian social activist, known for his work with lepers.
Deng Pufang (1944–): Chinese handicap people's rights activist, first son of China's former Paramount leader Deng Xiaoping.
David D. Friedman (1945–): Economist, law professor, novelist, and libertarian activist.
E. Haldeman-Julius (1889–1951): American social reformer and publisher, most noted as the editor of Appeal to Reason newspaper.
Norma Kitson (1933–2002): South African anti-apartheid activist.
Peter Kropotkin (1842–1921): Russian anarchist communist activist and geographer, best known for his book, Mutual Aid: A Factor of Evolution, which refutes social Darwinism.
Taslima Nasrin (1962–): Bangladeshi physician, writer, feminist human rights activist and secular humanist.
Ingrid Newkirk (1949–): British-born animal rights activist, author, and president and co-founder of People for the Ethical Treatment of Animals, the world's largest animal rights organization.
Henry Stephens Salt (1851–1939): English writer and campaigner for social reform in the fields of prisons, schools, economic institutions and the treatment of animals, a noted anti-vivisectionist and pacifist, and a literary critic, biographer, classical scholar and naturalist, and the man who introduced Mahatma Gandhi to the influential works of Henry David Thoreau.
Rosika Schwimmer (1877–1948): Hungarian-born pacifist, feminist and female suffragist.
Bhagat Singh (1907–1931): Indian revolutionary freedom fighter.