Encyclopedias, Almanacs, Transcripts, and Maps
- Iynx
- J. A. Strong
- J. Allen Hynek Center for UFO Studies
- J. C. Bhattacharyya
- J. J. Thomson, the Discovery of the Electron, and the Study of Atomic Structure
- J. N. de la Hire
- J. Presper Eckert, Jr
- J. Robin Warren
- J/?
- Jabir ibn Aflah
- Jabir ibn Hayyan (Geber)
- Jacamars: Galbulidae
- Jacanas: Jacanidae
- Jachowski, Jan (1891-?)
- Jack Lippes
- Jack St. Clair Kilby
- Jack William Szostak
- Jacks
- Jacks
- Jacks, L(awrence) P(earsall) (1860-1955)