Encyclopedias, Almanacs, Transcripts, and Maps
- Instituto de Estudios Parapsicológicos
- Instituto de Parapsicologia
- Instituto Mexicano de Investigaciones Siquicas
- Integral Yoga International (IYI)
- Integrated Automated Fingerprint Identification System
- Integrated Ballistics Identification System (IBIS)
- Integratron
- Intercosmic Association of Spiritual Awareness
- Interdisciplinarity
- Interferon Actions
- International Academy for Continuous Education
- International Association for Identification
- International Association for Near-Death Studies (IANDS)
- International Association for Psychotropic Research (IAPR)
- International Association for Religion and Parapsychology (IARP)
- International Association of Metaphysicians(IAM)
- International Association of Parapsychologists
- International Code of Medical Ethics
- International Commission on Radiological Protection
- International Congress of Psychical Research