Barnim IV of Pomerania (1325 – 22 August 1365) was a Duke of Pomerania-Wolgast-Rügen.
He was the second son of Duke Wartislaw IV of Pomerania-Wolgast and the brother of Bogislaw V and Wartislaw V. He married Sophie of Werle (1329–1364), the daughter of John II of Werle.
They had two sons, Wartislaw VI and Bogislaw VI, and a daughter, Elisabeth, who married Duke Magnus I of Mecklenburg.
He inherited Pomerania-Wolgast-Rügen when his father died in 1326.
He shared a guardian with his brother Bogislaw V, Duke of Pomerania-Wolgast-Rügen.