Jaca (Chaca in Aragonese) is a city of northeastern Spain near the border with France, in the midst of the Pyrenees in the province of Huesca. Jaca, a ford on the Aragón River at the crossing of two great early medieval routes, one from Pau to Zaragoza, was the fortified city out of which the County and Kingdom of Aragon developed: Jaca was the capital of Aragon until 1097 and also the capital of Jacetania.

Jaca is a city in northeastern Spain.