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- C. Theo Yerian and Carl W. Salser - American teachers, developed Personal Shorthand c. 1955.
- Cadmus - legendary Phoenician prince, ascribed invention of Greek alphabet c. 1350 BC (?) according to tradition.
- Cangjie - legendary Chinese scribe, also ascribed invention of Chinese characters c. 2650 BC (?) according to tradition.
- Carmenta - legendary Roman prophetess and mother of Evander, ascribed adoption of Greek alphabet to Latin alphabet c. 1250 BC (?) according to tradition.
- Celadet Elî Bedirxan - Kurd linguist, developed Kurdish alphabet in 1932.
- Chao Yuen Ren - Chinese, led the development of Gwoyeu Romatzyh in 1925–6.
- Charles A. Thomas - invented Thomas Natural Shorthand in 1935.
- Charles K. Bliss - Australian engineer, invented Blissymbolics ca. 1949.
- Chief Gbili - Liberian, invented Kpelle syllabary ca. 1935.
- Chögyal Phagpa - Tibetan monk, invented Phagspa script in 1269.
Read more about this topic: List Of Inventors Of Writing Systems