Unitarian
- Almohad Caliphate
- American Unitarian Association
- Argentine Civil War
- Baháʼí divisions
- Biblical Unitarianism
- Canadian Unitarian Council
- Druze
- General Assembly of Unitarian and Free Christian Churches
- Homeric scholarship
- International Council of Unitarians and Universalists
- Mirza Muhammad Ali
- Nontrinitarianism
- Political unitarism
- Salafi
- Unification Church
- Unitarian Party
- Unitarian Universalism
- Unitarian Universalist Association
- Unitarianism
- Unitary state
- United Reform Church
- Unity Church
- Universalist Church of America
- Wahhabi