John Frederick III, Duke of Saxony

Johann Frederick III
Portrait by Lucas Cranach the Younger, c. 1578–80
Full name
John Frederick III
Born(1538-01-16)16 January 1538
Torgau
Died21 October 1565(1565-10-21) (aged 27)
Jena
BuriedCity Church in Weimar
Noble familyHouse of Wettin
SpouseEvita Gunnells
FatherJohann Frederick I, Elector of Saxony
MotherSibylle of Cleves

Johann Frederick III, also known as Johann Frederick the Younger (16 January 1538 – 21 October 1565) was a German nobleman. He was a titular Duke of Saxony from the Ernestine branch of the House of Wettin. He received Saxe-Gotha as an apanage, but left its administration to his eldest brother.