Estopiñán del Castillo (Spanish: [estopiˈɲan del kasˈtiʎo]), in Ribagorçan: Estopanyà[2] (Catalan: [astopaˈɲa]; in Aragonese: Estupinyán) is a municipality located in the province of Huesca, Aragon, Spain.

According to the 2004 census (INE), the municipality had a population of 217 inhabitants.

In this municipality, the inhabitants speaks a variety transition of Catalan and Aragonese languages, called Ribagorçan.

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