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- FACTNet
- Fagan, Livingstone
- FAIR
- Fair Game
- Faith-Based and Community Initiatives, Office of
- Faith Defenders
- Faith Facts
- Faith Healing
- Faith Temple Church of the Apostolic Faith
- False Memory Syndrome
- Falun Dafa
- Falun Gong
- Families Against Cults
- Family, The
- Family Action Information and Resource (FAIR)
- Family Church of Peace
- Family Systems Research Group (FSRG)
- Fang-Cheng church
- FARMS
- Farrakhan, Louis
- Fatah
- Fatima, Our Lady of
- Fatwa
- FBI
- FCC
- FECRIS
- Federal Communications Commission
- Federation of New Religious Organizations of Japan
- Fellowship, The (Australia)
- Fellowship Church (Grapevine, Texas)
- Fellowship of Independent Christian Churches
- Feng Shui
- Fiat Lux
- Fiphaza, Nokulunga
- Fire!
- Fire Tunnels
- Firmage, Joe
- First Christian Fellowship for Eternal Sovereignty
- Fish, Darwin
- Fisher, Barry
- Fittkau-Garthe, Heide (Heide Fittkau-Garthe)
- Five-Fold Ministry
- Five Percent
- Five Pillars of Islam
- Flashpoint
- FLDS
- Flores de Leon, Dick and Suyapa
- FMS
- Focus on the Family
- Followers of Christ Church
- Foreningen Radda Individeau
- Fossmo, Helge (Helge Fossmo)
- Foundation for Ancient Research and Mormon Studies
- Foundation for Human Understanding
- Foundation for Religious Freedom
- Foundation for Religious Tolerance
- Foundation of Inner Peace
- Four Spiritual Laws, The
- Frangipane, Francis
- Freedom for Religions in Germany
- Freedom of Mind
- Freedom of Religion
- Freeman, Bill and Patsy
- Freemansonry
- Free Love Ministries
- Free Minds, Inc. (aka Freeminds)
- Friends
- Friends of Freedom
- Friends of the Bridegroom
- Friends of the Eucharist
- Frisbee, Lonnie : Lonnie Frisbee
- Fruit of the Spirit
- Fukunaga, Hogen
- Fundamentalism
- Fundamentalist Church of Jesus Christ of Latter Day Saints
- Furuli, Rolf