Miranda Dam (Portuguese: Barragem de Miranda) is a concrete buttress dam on the Douro, where the river forms the national border line between Spain and Portugal.

It is located in the municipality Miranda do Douro, in Bragança District, Portugal.

The dam contains 4 crest spillways (maximum discharge 11,000 m³/s) and one bottom outlet.

The power station contains 3 Francis turbine-generators with 58.84 (67)[2] MW each in an underground powerhouse.

[3] In 1995 an additional underground powerhouse was completed and a further Francis turbine with a 193 MW capacity went online.