Johann Sommer (Latin: Ioannes Sommerus; 1542–1574) was a Transylvanian Saxon Protestant theologian, poet and Despot Vodă's biographer.
[1] Born in Pirna, Sommerus came to Moldavia as secretary to the reforming prince Jacob Heraclides (Despot Vodă), becoming the main figure in the short-lived College of Cotnari (Schola Latina) (1562–1563).
Sommer moved to Transylvania and led a similar school in Braşov (the one founded by Johannes Honter, the Honterus-Gymnasium in Kronstadt), from 1565 to 1567.
He moved on to the John Sigismund Unitarian Academy, Kolosvar (1570–1574).
According to the 18th-century historian Johann Seivert, he married the daughter of Ferenc Dávid, and this statement was overtaken by many other sources; however, there are no direct proofs of this, and it is in contradiction with more proven facts.