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- Heinrich Cornelius Agrippa - German alchemist, created the Transitus Fluvii, Malachim, and Celestial Alphabets, c. 1525.
- Hildegard of Bingen - German nun, invented Litterae ignotae c. 1150.
- Honorius of Thebes - possibly mythical author, ascribed invention of Theban alphabet c. 1220 (?).
- Hussein Sheikh Ahmed Kaddare - Somali, invented Kaddare script c. 1953.
Read more about this topic: List Of Inventors Of Writing Systems