Castillonroy (Spanish: [kastiʎonˈroj]) or Castellonroi (Catalan: [kasteˌʎonˈrɔj]) is a municipality located in the province of Huesca, Aragon, Spain.

According to the 2007 census (INE), the municipality has a population of 382 inhabitants.

It has two official names: Castillonroy and Castellonroi.

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