Birthdays of famous freethinkers, freethought history, and freethinking quotations, by category. (Unless otherwise indicated, these are birthdates.)
- Activists
- Abolitionists
- Civil Rights Activists
- Environmental Activists
- Freethought Activists
- Labor Leaders
- Peace Activists
- Women's Rights Activists
- American Revolution
- Architects
- Artists
- Cartoonists
- Athletes
- Attorneys & Judges
- Composers
- Critics
- Computer Scientists
- Dancers
- Economists
- Editors
- Educators
- Entertainers
- Academy Award Winners
- Actors
- Comedians
- Humorists
- Radio Personalities
- Magicians
- Directors/Producers/Filmmakers
- Screenwriters
- Entrepreneurs
- Environmentalists
- Explorers
- Fashion
- Feminists
- Former Clergy
- Heretics/Martyrs
- Humanitarians
- Holiday
- Inventors
- Legal events
- Mathematicians
- Military Figures
- Musicians
- Naturalists
- Nobel Prize Winners
- Philanthropists
- Philosophers
- Physicians
- Politicians
- Monarchs
- Presidents
