Hernani is a town and municipality located in the province of Gipuzkoa, Basque Country, Spain. The town sits on the left bank of the Urumea river.It is located at a distance of 9.2 km from San Sebastian. The municipality of Hernani occupies an area of approximately 40 square kilometers and is bordered by San Sebastián, Astigarraga, Arano, Elduayen, Renteria, Lasarte-Oria and Urnieta.

From the town center, at the foot of Mount Santa Barbara, it is possible to see a large area of the valley of Urumea. Its festivities, held between 23 and June 27 in honor of John the Baptist; and between his celebrations it is to emphasize the popular "Azeridantza"..

The title character of Victor Hugo's play Hernani is named after the town.