| Coordinates | 43°20′27″N 2°39′18″W |
|---|---|
| Country | Spain |
| Autonomous community | Basque Country |
| Province | Biscay |
| Comarca | Busturialdea |
| Mayor | Domingo Bilbao Etxebarria |
| Area total | 12 km² |
| Elevation | 13 m |
| Time zone | CET (UTC+1) |
| Time zone (DST) | CEST (UTC+2) |
| Postal code | 48315 |
| Website | www.kortezubi.eus |
Kortezubi is a town and municipality located in the province of Biscay, in the Basque Autonomous Community, northern Spain. It has 444 inhabitants.