Encyclopedias, Almanacs, Transcripts, and Maps
- International Psychic Gazette
- International Psychic Register
- International Self-Realization Healing Association (ISRHA)
- International Sivananda Yoga Vedanta Centers
- International Society for the Investigation of Ghosts
- International Society for the Study of Subtle Energies and Energy Medicine (ISSSEEM)
- International Society of Cryptozoology (ISC)
- International Society of Life Information Science
- International Spiritual Frontiers Fellowship
- International Spiritualist Alliance
- International Spiritualist Congress
- International Spiritualists Federation (Fédération Spirites Internationale)
- International UFO Reporter (Magazine)
- International Yoga Guide
- Internet and the World Wide Web
- Internet and the World Wide Web
- Internet File Transfer and Tracking
- Internet File Transfer and Tracking
- Internet Search Engine
- Interplanetary Space Travel Research Association (ISTRA)