Gipuzkoa (in Basque and also the official form since 2011, [ɡipus̻ko.a]; in Spanish: Guipúzcoa [ɡiˈpuθko.a]; French: Guipuscoa) is a province of Spain and a historical territory of the autonomous community of the Basque Country. Its capital city is Donostia-San Sebastián. Gipuzkoa shares borders with the French department of Pyrénées-Atlantiques at the northeast, with the province and autonomous community of Navarre at east, Biscay at west, Álava at southwest and the Bay of Biscay to its north. It is located at the easternmost extreme of the Cantabric Sea, in the Bay of Biscay. It has 66 kilometres (41 miles) of coast land.

With a total area of 1,980 square kilometres (760 square miles), Gipuzkoa is the smallest province of Spain. The province has 89 municipalities and a population of 715,148 inhabitants (2014), from which more than half live in the Donostia-San Sebastián metropolitan area. Apart from the capital, other important cities are Irun, Errenteria, Zarautz, Mondragón, Eibar, Hondarribia, Oñati, Tolosa, Beasain and Pasaia.