John V of Brandenburg-Salzwedel

John V, called Illustris (1302 – 26 March 1317), was an Ascanian margrave of Brandenburg-Salzwedel, the son of Margrave Herman the Tall and Anne of Austria. Six years old when his father died besieging Lübz in 1308, he succeeded him as margrave and co-ruler of Brandenburg.

He married Catherine, daughter of Duke Henry III of Glogau, but died on 26 March 1317 as a teenager. With his early death the Brandenburg-Salzwedel Ascanian line became extinct, and his cousin Waldemar ruled the margraviate alone.