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.

Jajce is a town and municipality in the Central Bosnia Canton of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina. According to the 2013 census, the town has a population of 7,172 inhabitants, with 27,258 inhabitants in the municipality, It is situated in the region of Bosanska Krajina, on the crossroads between Banja Luka, Mrkonjić Grad and Donji Vakuf, on the confluence of the rivers Pliva and Vrbas.