- Duchamp, Marcel, 1887-19681
- Fessard, Claude Mathieu, b. 17401
- Flamel, Nicolas, d. 14181
- Frush, Wm. H. (William H.)1
- Gilbert, de La Porrée, Bishop, ca. 1075-11541
- Gualdi, Federico1
- Guillaume, de Deguileville, 14th cent.1
- Haimo, of Auxerre, d. ca. 8551
- Haskins, Ralph, 1779-18521
- Heinrich, von St. Gallen, fl. 1371-13971
- Hugh, of Saint-Victor, 1096?-11411
- Hus, Jan, 1369?-14151
- Jacobus, de Voragine, ca. 1229-12981
- Jābir ibn Ḥayyān1
- Jighmīnī, Maḥmūd ibn Muḥammad, d. 1221? Mulakhkhaṣ fī al-hayʾah1
- John, of Wales, 13th cent1
- Johnson, Maurice, 1688-17551
- Jones-Parry, John Parry, 1829-19201
- Jordan von Martinsbuech, Christoff1
- Jorn, Asger, 1914-19731