Oiartzun
| Oiartzun | |
|---|---|
| Coordinates: 43°17′55″N 1°51′40″W / 43.29861°N 1.86111°W | |
| Country | Spain | 
| Autonomous community | Basque Country | 
| Province | Gipuzkoa | 
| Eskualdea | Oarsoaldea | 
| Founded | 1453 | 
| Government | |
| • Mayor | Joana Mendiburu Garaiar (EH Bildu) | 
| Area | |
|  • Total | 59.71 km2 (23.05 sq mi) | 
| Population  (2018) | |
|  • Total | 10,276 | 
| • Density | 170/km2 (450/sq mi) | 
| Demonym(s) | Basque: oiartzuar Spanish: oyarsonense | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal code | 20180 | 
| Website | Official website | 
Oiartzun (Basque: Oiartzun, Spanish: Oyarzun) is a town and municipality located in the Basque Country, in the province of Gipuzkoa lying at the foot of the massif Aiako Harria (Peñas de Aya in Spanish).