| Avoca River | |
| Name Etymology: | Presumed to be named after Avoca Homestead and the station of the same name in the area |
| Pushpin Map: | New Zealand |
| Pushpin Map Alt: | Relief map of New Zealand |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | Canterbury |
| Subdivision Type3: | District |
| Subdivision Name3: | Selwyn District |
| Source1: | Moraine Flat |
| Source1 Coordinates: | -43.0488°N 171.4244°W |
| Mouth: | Harper River |
| Progression: | Harper River→ Lake Coleridge→ Rakaia River→ Canterbury Bight |
| Tributaries Left: | Easy Stream, Blind Creek, Galilee Creek, Amphitheatre Creek, Centre Creek |
| Tributaries Right: | Hanging Valley Creek, Basin Creek, Mid Basin Creek, Triangle Creek, Lillian Creek |
The Avoca River is a river in the Canterbury region of New Zealand. It is a minor tributary of the Rakaia River via the Harper and Wilberforce Rivers, south of Arthur's Pass in Canterbury.