| Alda | |
| Settlement Type: | Concejo |
| Image Alt: | A church |
| Pushpin Map: | Spain Álava#Spain Basque Country#Spain |
| Pushpin Label: | Alda |
| 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: | Montaña Alavesa |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Harana/Valle de Arana |
| Area Total Km2: | 6.08 |
| Population As Of: | 2021 |
| Population Footnotes: | [1] |
| Population Total: | 29 |
| Population Density Km2: | auto |
| Coordinates: | 42.7528°N -2.3311°W |
| Elevation M: | 816 |
| Postal Code Type: | Postal code |
| Postal Code: | 01117 |
Alda (in Basque pronounced as /alda/, pronounced as /es/)[2] is a hamlet and concejo located in the municipality of Harana/Valle de Arana, in Álava province, Basque Country, Spain. It is the capital of the municipality.[3]