| Native Name: | Catalan; Valencian: Estopanyà (Ribagorçan) |
| Subdivision Name3: | Estopiñán del Castillo/Estopanyà |
| Area Total Km2: | 88.7 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Estopiñán del Castillo (pronounced as /es/), in Ribagorçan: Estopanyà[1] (in Catalan; Valencian 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.