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- Saint Clement of Ohrid - Archbishop, ascribed invention of Cyrillic c. 900, according to tradition.
- Saint Mesrob - Armenian monk, created the Armenian alphabet in c. 405.
- Saint Cyril - Greek monk, believed to have created Glagolitic alphabet c. 863.
- Saint Shahjalal - Bengali, ascribed invention of Syloti Nagri alphabet c. 1300, according to tradition.
- Sam Pollard - British missionary, invented Pollard script in 1905.
- Samuel F. B. Morse - American inventor, invented Morse code c. 1835.
- Samuel Taylor - American, invented Universal Stenography system of shorthand in 1792.
- Sejong the Great of Joseon - Korean king, invented Hangul writing in c. 1443, promulgated in 1446.
- Sequoyah, Cherokee silversmith, invented Cherokee syllabary c. 1819.
- Sheikh Abdurahman Sheikh Nuur - Somali, invented Borama script c. 1933.
- Shong Lue Yang - Laotian, created Pahawh Hmong alphabet in 1959.
- Sirijonga - Nepalese king, ascribed invention of Limbu alphabet c. 880, according to tradition.
- Stephen of Perm - Russian missionary, invented the Old Permic script alphabet in 1372.
- Sol Chong - inventor of the Korean Idu script and Gugyeol script (c.650 - c.730), according to tradition.
- Solomana Kante - Guinean author, invented the N'Ko alphabet in 1949.
Read more about this topic: List Of Inventors Of Writing Systems