Aguieira Dam (Portuguese: Barragem da Aguieira) is a multiple-arch dam on the Mondego River, located on border line between the municipalities of Mortágua and Penacova, in Central Portugal.

Besides power production the dam is also used for flood control, water supply and irrigation.

[1] At full reservoir level of 117 m (maximum flood level of 126 m) the reservoir of the dam has a surface area of 20 km² and its total capacity is 423 mio.

[2] The reservoir submerged the villages of Breda (in the municipality of Mortágua) and Foz do Dão (in the municipality of Santa Comba Dão).

The power station contains 3 Francis turbine-generators with 112.4 MW each in a surface powerhouse at the toe of the dam.