Ivaniš Nelipić or Ivan III Nelipić (1379–1435) was a Croatian nobleman who was prince of Cetina and Omiš. He was also titular Ban of Croatia and Dalmatia in 1419 and was a member of one of the most powerful Croatian noble families at the time. At the peak of his power, he ruled areas in inner Croatia from the mountain of Velebit to the Cetina river. From 1401 to 1435, he ruled over Klis Fortress, although his main seat was at Knin in Knin Fortress. During his reign, he was greatly involved in conflicts over Bosnia. Later, he was also recognized as duke of the Dalmatian cities, specifically Trogir, Split and Skradin.