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San Sebastián (Spanish: [san seβasˈtjan]) or Donostia (Basque: [doˈnos̺tia]) is a coastal city and municipality located in the Basque Autonomous Community, Spain. It lies on the coast of the Bay of Biscay, 20 km (12 miles) from the French border. The capital city of Gipuzkoa, the municipality's population is 186,095 as of 2015, with its metropolitan area reaching 436,500 in 2010.

The City Council of San Sebastián (Basque: Donostiako Udala, Spanish: Ayuntamiento de San Sebastián) is the institution that governs the Basque city of San Sebastián (Spain). Its premises are located in the former casino of the city next to the Bay of La Concha.

Donostialdea is one of the eight regions of Gipuzkoa, in the Basque Autonomous Community, corresponding to the basin of the lower Urumea River, along with a strip of basin corresponding to the Oria River, the region borrowing its name from Donostia-San Sebastián, the capital city of Gipuzkoa in Spain.