Gargallo is a municipality in the Andorra-Sierra de Arcos comarca, located in the province of Teruel, within the autonomous community of Aragon, Spain. It lies in the eastern part of the province, in a region characterised by its rugged terrain and historic mining heritage.
According to the 2010 census, the municipality had a population of 140 inhabitants, making it a small and sparsely populated rural community. Its postal code is 44558.