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- "I Am" Activity
- Iatrosofie
- Icke, David
- Identity Movement
- Iglesia Ni Cristo
- Igreja Universal do Reino de Deus (IURD)
- IHOP
- Illuminati
- Immanuael Ministries
- Impartation
- Incest Survivor Syndrome
- Inclusive-Language Bible Versions
- India
- Indianapolis Baptist Temple
- Infinity Forms of Yellow Remember
- Info-Cult
- INFORM
- InfoSekta
- Ingram, Larry
- Inner Healing
- Institute for Historical Review
- Institute for Religious Research
- Institute for Study of American Religion (ISAR)
- Institute in Basic Living Principles
- Institute in Basic Youth Conflicts
- Institute of Biblical Defense
- Interdenominational
- Interfaith
- Interfaith Center of New York
- International Churches of Christ (ICOC)
- International Coalition for Religious Freedom
- International House of Prayer
- Internet, Religion on the
- Interpretation
- Inter-Religious and International Federation for World Peace (IIFWP)
- Intervention
- Introvigne, Massimo
- Invisible Church, The
- Irenaeous Foundation, The
- IRR
- Irving, David
- ISKCON
- Islam
- Islamic Jihad
- Islamism
- Islamophobia
- ISS
- Isa Masiya