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- J. R. R. Tolkien - British author, invented the Tengwar and Sarati c. 1930.
- James Evans - Canadian missionary, invented a syllbary used for Ojibwe and Cree c. 1840, these days referred to as Cree syllabics.
- James Hill - British, developed Teeline Shorthand in 1970.
- James O. Fraser - Scottish missionary, invented Fraser alphabet c. 1915.
- Jeremiah Rich - English, invented a system of shorthand in 1654.
- J.M.R. LeJeune - Canadian, created Chinook writing, 1893, an adaptation and expansion of Duployan.
- Johannes Pantheus - German author, invented Enochian alphabet in 1478.
- Johannes Trithemius - German cryptographer, invented an "Angelic" (magical) alphabet in 1499.
- John Byrom - British poet, invented a system of shorthand c. 1715.
- John Dee - English alchemist, invented another Enochian alphabet ca. 1582.
- John R. Malone - American, developed the UNIFON alphabet ca. 1955.
- John Robert Gregg - Irish author, invented Gregg Shorthand c. 1888.
- John William Tims - American, developed Blackfoot syllabary c. 1890.
- John Willis - English, invented a system of shorthand in 1602.
Read more about this topic: List Of Inventors Of Writing Systems