Rudolf IV, Margrave of Baden-Pforzheim (died 25 June 1348) was a son of Margrave Herman VII of Baden and his wife, Agnes of Truhendingen. As a younger son, he was initially destined for an eccesiastical career. He became canon at Speyer. When his father died in 1291, Baden was divided and he received Baden-Pforzheim. Initially, he ruled Baden-Pforzheim jointly with his brother, Herman VIII. From 1300 until his death, he ruled alone. In 1335, he inherited Baden-Baden from his first cousin Rudolf Hesso.