Castiello de Jaca (in Aragonese: Castiello de Chaca) is a municipality located in the province of Huesca, Aragon, Spain.

According to the 2004 census (INE), the municipality has a population of 198 inhabitants.

It is serviced by the Jaca-Astun bus.

Recent developments have seen the size of the town increase greatly.

This article about a location in the Province of Huesca is a stub.