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- UFOs
- "Una Voce Grida…!"
- UNADFI
- Unarius Academy of Science
- Unbiblical
- "Understanding Cult Mind Control"
- "Unholy Devotion – Why Cults Lure Christians"
- Unification Church
- Unionism
- Unitarian Universalism
- United Christian Conventions of Australia and New Zealand
- United Church of God
- United Effort Plan (UED)
- United Nuwaubian Nation of Moors
- United Pentecostal Church
- United Religions Initiative
- Unity
- Unity School of Christianity
- Universalism
- Universal Church of the Kingdom of God
- Universal Life Church
- University Bible Fellowship
- Unorthodox
- Unravelling Wittgenstein’s Net
- Unsound doctrine
- Upside Down Club
- Urantia
- U.S. Commission on Human Rights
- U.S. Commission on International Religious Freedom
- USA
- Uskontojen uhrien tuki ry
- Utah Lighthouse Ministry