The siege of Jajce took place between 10 July and 24 August 1464, during the Ottoman conquest of Bosnia and Herzegovina, when an Ottoman army under Sultan Mehmed II made a new attempt to retrieve Bosnia and conquer the strategic fortress of Jajce, south of Banjaluka. Despite massive bombardment, the final Turkish assault was heavily repulsed and after hearing that King Mathias of Hungary was approaching with a relief army, Mehmed abandoned the siege.