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- Lalich, Janja
- Lama
- Lamaism
- Landes, Richard
- Landmark Education
- Langone, Michael
- Larson, Bob
- Latter Day Church of Christ
- Latter Day Saints
- Latter Rain Movement
- Latter Rain Theology
- LaVey, Anton Szandor
- Lausanne Covenant
- Layton, Deborah
- LDS
- L’Engle, Madeleine
- Leadership University
- "Lead Us Not Into Deception"
- Lee, Jason Samuel
- Lee, Witness
- Left Behind (Time LaHaye and Jerry Jenkins)
- Left Behind — Answered Verse by Verse
- Leo J. Ryan
- Leo J. Ryan Education Foundation [Cult-Info]
- Leo J. Ryan Education Foundation [Scientology]
- Lesbianism
- Levitating
- Lewis, C.S.
- Lewis, Gordon R.
- Lewis, James R.
- LGATs
- Li Hongzhi
- Liefhebber, Peter
- Life Space
- Lifeline
- Lifton, Robert
- Light of Truth Ministries
- Lightning from the East
- Ligonier Ministries
- Lindsey, Hal
- Lisa McPherson Foundation
- Lisa McPherson Trust
- Little Pebble
- Livets Ord
- Living Church of God
- Living Stream Ministry
- Living Truth Ministries
- Local Church
- Loftus, Elizabeth
- Logical Fallacies, Stephen’s Guide to the
- Logos
- London City Church
- Lord Of All
- Lord, I Believe
- Lord’s Recovery
- Lord’s Resistance Army
- Lost Tomb of Jesus
- Lott, Clyde
- Love Bombing
- Lucado, Max