Durangaldea (Spanish: Duranguesado) is a comarca of Biscay located in the Basque Country, Spain.

Most of the towns that compose the comarca are located on a great valley formed by the Ibaizabal river, that crosses it from east to west.

Durangaldea (also known by its Spanish name, Duranguesado) was during the Middle Ages a district apart from Biscay (the Señorío) and a dependency of Navarre, but was conquered by Castile in 1200.

It remained separate from Biscay until 1630, and it held its own compilation of laws, with its regional council joining in Gerediaga, Abadiño.

The Cantabric Highway also crosses the comarca, and can be accessed from Durango and connects the city with Bilbao, Donostia and the French border.