Santurtzi is a port town in the province of Biscay, in the autonomous community of Basque Country, Spain. It is located in the Bilbao Abra bay, near the mouth of the Nervión river, on its left bank, 14 km downriver from Bilbao and forms part of the Greater Bilbao agglomeration. It has a population of 45,853 (2019) and a land area of 6.77 km2.

The Port of Bilbao is located on the Bilbao Abra bay, and along the Estuary of Bilbao, in Biscay. The main facilities are in the Santurtzi and Zierbena municipalities, approximately 15 km (9.3 mi) west of Bilbao. Also called Exterior Port and Superpuerto, the port complex occupies 3.13 km2 of land and 16.94 km2 of water along 17 km (10.6 mi) of waterfront.