John IV, Count of Oldenburg

John IV (documented 1331–1356) was Count of Oldenburg, the eldest son of Count John III and his wife Mechthild. From 1345 he issued charters jointly with his uncle Conrad I, including the grant of Bremen town law to the city of Oldenburg in January 1345.

After Conrad's death in 1347 he ruled together with his cousin Conrad II. No marriage or children of his are recorded; he died on 6 October 1356, and the dynastic succession was continued by his cousin's descendants.