Gostun (Bulgarian: Гостун) is a village (село) in southwestern Bulgaria, located in the Bansko Municipality (Община Банско) of the Blagoevgrad Province (област Благоевград). It is located on the eastern slopes of the Rhodope Mountains, east of Mesta river 17 kilometers southeast of Bansko, 54 kilometers southeast of Blagoevgrad and 103 kilometers southeast of Sofia.