Monreale (Sicilian: Murriali) is a town and comune in the province of Palermo, in Sicily, Italy, on the slope of Monte Caputo, overlooking the very fertile valley called "La Conca d'oro" (the Golden Shell), famed for its orange, olive and almond trees, the produce of which is exported in large quantities. The town has a population of approximately 30,000, and it is located 15 km (12 mi) south of Palermo.

After the occupation of Palermo by the Arabs the Bishop of Palermo was forced to move his seat outside the capital. The role of the new cathedral was assigned to a modest little church, Aghia Kiriaki in the village nearby which was later called Monreale. After the Norman conquest in 1072 Christians got back the old city cathedral. Probably this role as temporary ecclesiastical centre played a part in King William II's decision to build here his famous cathedral.

The town was for long a mere village, and started its expansion when the Norman Kings of Sicily chose the area as their hunting resort, building here a palace (probably identifiable with the modern Town Hall).