Encyclopedias, Almanacs, Transcripts, and Maps
- James Stuart
- James Van Allen
- James W. Christy
- James W. Cronin
- James Waddell Alexander
- James Young Simpson
- James, T. P. (ca. 1874)
- Jan Evangelista Purkinje
- Jan Huyghen van Linschoten
- Jane Farquhar Colden
- Jane Sharp
- Jane X. Luu
- Jannasch, Holger Windekilde (1927-1998)
- Janos Bolyai
- Japan's Dragon's Triangle
- Japanese High-Energy Accelerator Research Organization, KEK
- Japanese Perspectives
- Japanese Society for Parapsychology
- Jaquin, Noel (1894-1974)
- Jarman, Archibald Seymour (1909-)