| Valderejo | |
| Settlement Type: | Concejo |
| Pushpin Map: | Spain Álava#Spain Basque Country#Spain |
| Pushpin Label Position: | right |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Basque Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Álava |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Añana |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Valdegovía/Gaubea |
| Area Footnotes: | [1] |
| Area Total Km2: | 35.75 |
| Population As Of: | 2023 |
| Population Footnotes: | [2] |
| Population Total: | 12 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 01427 |
Valderejo is a concejo in the municipality of Valdegovía/Gaubea, in Álava province, Basque Country, Spain. It contains the hamlets of (the capital of the concejo) and, as well as the depopulated settlements of and Ribera. It is conterminous with the . It was an independent municipality until 1966, when it was absorbed by Valdegovía.[3]