Andoain is a town in the province of Gipuzkoa, in the autonomous community of Basque Country, in the North of Spain.

Andoain is recognized by its green areas surrounding the rivers, which are dense forests, very suitable for hiking and biking (Leizaran Valley).

Andoain is situated in the Oria valley, closer to Belkoain mountain.

The town is surrounded by several mountains: Buruntza (439 m), Belkoain (488 m), Aizkorri (598 m), Usobelartza (647 m) and Adarra (817 m) and the oria river goes throw the city center.

Average annual rain reaches 1700 mm and mean temperature is 14 C. Current town mayor is Andoni Alvarez Lete from EH Bildu.