Postcards of Unitarian and Universalist Church Buildings
- Searchable database of digitized images of nineteenth- and twentieth-century postcards picturing Unitarian and Universalist church buildings.
- http://www.hds.harvard.edu/library/collections/digital/postcards.html

The Unitarian Universalist Tradition: A Basic Research and Reading List
- Annotated list of print and Internet resources, prepared for the Harvard Divinity School community by Andover-Harvard Theological Library.
- http://www.hds.harvard.edu/library/research/guides/uu/index.html

Dictionary of Unitarian and Universalist Biography
- Online biographies commissioned by the Unitarian Universalist Historical Society.
- http://www.uua.org/uuhs/duub/

Unitarian History
- An article written by Ken Morrison of the Lakehead Unitarian Fellowship, Thunder Bay, Ontario, Canada.
- http://www.luf.ca/uuhist.htm

Reflections of Public Ministry at Harvard Divinity School
- An online exhibit.
- http://www.hds.harvard.edu/library/exhibits/online/hdspublicministry/

Unitarian Universalist Origins
- History of the Unitarian Universalist religion by Mark W. Harris, former director of public information for the UUA.
- http://www.uua.org/info/origins.html

Socinianism
- Catholic Encyclopedia article on this body of doctrine held by one of the Antitrinitarian sects that gave rise to Unitarianism.
- http://www.newadvent.org/cathen/14113a.htm

Universalism on the Pacific Coast
- Articles include history of individual churches, including ones that no longer exist.
- http://www.lafn.org/~dave/uu/universalism

Unitarian Universalists in Science Fiction
- Annotated list of science fiction novels and stories with UU characters or references. Also, UU authors of science fiction.
- http://www.adherents.com/lit/sf_uu.html

Professor Brought Christmas Tree to New England
- From the Harvard Gazette, an article on Unitarian minister and abolitionist Charles Follen, and the story of how he promoted the Christmas tree.
- http://www.news.harvard.edu/gazette/1996/12.12/ProfessorBrough.html

Unitarian Universalist Historical Society
- Links for Unitarian Universalist history.
- http://www.uua.org/uuhs/