Grand Duke of Bosnia (Serbo-Croatian: Veliki Vojvoda Bosanski), in most charters styled as Serbo-Croatian: Veliki vojvoda rusaga Bosanskog, (Latin: Bosne supremus voivoda / Sicut supremus voivoda regni Bosniae), was a court title in the Kingdom of Bosnia, bestowed by the King to highest military commanders, usually reserved for most influential and most capable among highest Bosnian nobility. To interpret it as an office post rather than a court rank could be more accurate, although it was not hereditary it served both purposes and was retained for life by a noblemen who gained it.