Husein Gradaščević (Husein-kapetan) was an Ottoman Bosnian military commander who led an uprising against the Tanzimat, modernising political reforms in the Ottoman Empire. Born into a Bosnian noble family, Gradaščević became the captain of Gradačac in the early 1820s, succeeding his relatives in the position. He grew up surrounded by a political climate of turmoil in the western reaches of the Ottoman Empire. With the Russo-Turkish war (1828–29), Gradaščević's importance rose; the Bosnian governor gave him the task of mobilizing an army between the Drina and Vrbas.

Gradačac is a city located in the Tuzla Canton of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina. It is situated in the northeastern part of Bosnia and Herzegovina, roughly 40 km (25 mi) south of the Sava river. As of 2013, it has a population of 39,340 inhabitants. The city is well known for its castle.