| Severn River | |
| Source1 Location: | Raglan Range |
| Mouth Location: | Confluence with Acheron River |
| Progression: | South-southeast |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | Marlborough Region, South Island |
| River System: | Waiau Toa / Clarence River system |
| Tributaries Right: | Alma River |
The Severn River is in the South Island of New Zealand.[1] The headwaters of the river are in the Raglan Range and it flows into the Acheron River.[2] One of its tributaries is the Alma River.