Ontiñena is a municipality in the province of Huesca, in the autonomous community of Aragon, Spain. It is located in the comarca of Bajo Cinca, in the eastern part of the province near the border with Catalonia.
According to the 2004 census (INE), the municipality had a population of 623 inhabitants. Like many small municipalities in rural Aragon, it is characterised by a low population density and a settlement pattern centred on its main village.