The Siege of Jajce was a siege of the town of Jajce and its citadel in 1463, in a push by Ottomans to conquer as much of the Bosnian Kingdom, and continuation of the Ottoman–Hungarian Wars. After the fall of Travnik and royal fortress of Bobovac, in the initial days of invasion, Ottomans, led by Sultan captured the town. One of the parties pursued Bosnian King Stjepan Tomašević, and caught up with him at Ključ fortress, after which he was brought to Jajce and executed. Soon the Ottomans forces withdraw, leaving the town under the protection of a small garrison. The Hungarian took the opportunity to capture the citadel, and this meant that Ottoman advancement in Bosnia was halted for the time being. The northern part of Bosnia were brought under Hungarian control, and divided into three administrative regions, Banate of Jajce, Banate of Srebrenik, established around Srebrenik fortress, and a puppet statelet named "Bosnian Kingdom". This situation and Jajce under Hungarian garrison will last until 1527 when the Ottomans finally took the town, and breaking the lines advanced northward to Hungary and westward to Bihać, which was part of the Kingdom of Croatia.

The Walled City of Jajce is a medieval fortified nucleus of Jajce in Bosnia and Herzegovina, with Jajce Citadel high above town on top of pyramidal-shaped steep hill, enclosed with approximately 1,300 metres (4,300 ft) long defensive walls,. It is one of the best preserved fortified capitals of the Bosnian Kingdom, the last stronghold before the kingdom dissolved under the pressure of military advancement at the onset of Ottoman Empire takeover.