Unitarians and Universalists On Stamps
- Online exhibit of U. S. postage stamps commemorating the lives of Unitarians and Universalists.
- http://www.uuquincy.org/projects/stamps/

Servetus International Society
- Bringing together people who are committed to foster the spirit of humanism, tolerance of ideas, and respect for the rights of the individual by preserving and promoting the Michael Servetus Heritage as intellectual giant, model of integrity, and standard
- http://www.servetus.org/

Michael Servetus
- Chronology, list of published works, reprinted writings, and links related to the Unitarian martyr, compiled by Randall D. Hughes.
- http://www.godglorified.com/michael_servetus.htm

Famous Unitarian Universalists
- Lists of, and basic information about, famous women and men with Unitarian, Universalist, or Unitarian Universalist connections, organized by category (e.g. Politics). Site maintained by UU minister Jone Johnson Lewis.
- http://www.famousuus.com/

Ralph Waldo Emerson (1803-1882): A Guide to Resources
- At one time a Unitarian minister, Emerson's thought was and is a major influence on Unitarian Universalism.
- http://www.transcendentalists.com/1emerson.html

Unitarian Universalist Women's Heritage Society
- The UUWHS seeks to discover women who were active in liberal religious communities, and to prepare and present related research through its publications program.
- http://www.uuwhs.org/

Notable American Unitarians
- Features an ever-growing library of illustrated biographies of prominent American Unitarians. Compiled by Herbert Vetter, retired minister of First Parish, Cambridge.
- http://www.harvardsquarelibrary.org/unitarians/