| Settlement Type: | Municipality |
| Official Name: | A Arnoia |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Coordinates: | 42.2503°N -8.1331°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | O Ribeiro |
| Area Total Km2: | 20.69 |
| Elevation M: | 76 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Government Type: | Concello |
| Governing Body: | Concello de A Arnoia |
| Leader Party: | PPdeG |
| Leader Title: | Mayor |
| Leader Name: | Rodrigo Aparicio Santamaría[1] [2] |
| Area Code Type: | INE municipality code |
| Area Code: | 32003 |
A Arnoia is a municipality in the province of Ourense in the Galicia region of north-west Spain. It is located to the west of the province, by the confluence of the río Arnoia and the río Miño.