Encyclopedias, Almanacs, Transcripts, and Maps
- Inuit Religious Traditions
- Ioann of Kronstadt
- Iodine 131
- ionic compound
- Ipatieff, Vladimir Nikolaevitch (1967–1952)
- Ippen
- Iqb?l, Mu?ammad
- Iranian Religions
- Irenaeus
- Iron Minerals
- Iroquois Religious Traditions
- irrational number
- Isaac the Syrian
- Ishr?q?yah
- Islam: Islam in Andalusia
- Islam: Islam in Central Asia
- Islam: Islam in China
- Islam: Islam in Modern Europe
- Islam: Islam in North Africa
- Islam: Islam in South Asia