| Ullíbarri-Gamboa | |
| Settlement Type: | Concejo |
| Pushpin Map: | Spain Álava#Spain Basque Country#Spain |
| Pushpin Label Position: | left |
| 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: | Gorbeialdea |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Arratzua-Ubarrundia |
| Area Total Km2: | 7.23 |
| Population As Of: | 2021 |
| Population Footnotes: | [1] |
| Population Total: | 81 |
| Population Density Km2: | auto |
| Elevation M: | 559 |
| Postal Code Type: | Postal code |
| Postal Code: | 01520 |
Ullíbarri-Gamboa (pronounced as /es/, eu|Uribarri Ganboa in Basque pronounced as /uɾiβari ɣamboa/)[2] is a hamlet and concejo located in the municipality of Arratzua-Ubarrundia, in Álava province, Basque Country, Spain.
The hamlet gives its name to the Ullíbarri-Gamboa Reservoir, the largest in the Basque Country,[3] The construction of the dam, between 1947 and 1956, flooded part of the village as well as most of its farmland, forcing many residents to move to nearby Vitoria-Gasteiz.[4]
The word Ullíbarri literally means "new town" in Basque, from uri (an archaic form of hiri, meaning "city") and barri (a dialectal form of berri, meaning "new").[2] Gamboa is the name of the valley which was flooded by the reservoir, as well as a former municipality in the area (Ullíbarri-Gamboa was not part of the municipality).[5]