Mallén is a municipality in the province of Zaragoza, in the Aragon region of Spain. Its postal code is 50550. According to the 2010 census, the municipality had a population of 3,074 inhabitants.
The town is located in the Huecha River valley, close to Road N-232 and near the Ebro on its right side.
Belsinon, an ancient Celtiberian archaeological site, is located in the Cerro del Convento hillock near Mallén. The hillock was formerly known as Mania or Manlia.