Langa del Castillo is a municipality in the province of Zaragoza, within the autonomous community of Aragon, Spain. It is a small, rural settlement in this part of northeastern Spain.
According to the 2004 census conducted by the Instituto Nacional de Estadística (INE), the municipality had a population of 175 inhabitants. This figure reflects the modest size typical of many municipalities in the Zaragoza province's rural areas.
As a municipality, Langa del Castillo holds administrative status within the Zaragoza province, which forms part of the broader Aragon region. Its recorded population of 175 in 2004 places it among the smaller municipalities of the area.