| Mueller River | |
| Name Etymology: | Named after Ferdinand von Mueller |
| Pushpin Map: | New Zealand South Island#New Zealand |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Mueller River |
| Source1: | Dispute Glacier |
| Source1 Coordinates: | -44.1377°N 168.9652°W |
| Mouth Location: | Turnbull River |
| Mouth Coordinates: | -44.0331°N 168.9744°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | West Coast |
| Subdivision Type3: | District |
| Subdivision Name3: | Westland |
| Length: | 17km (11miles) |
| Progression: | Mueller River → Turnbull River → Tasman Sea |
| Tributaries Left: | Emily Torrent, Icicle Creek, Neverfail Creek, Solitude Torrent, Mistake Creek |
| Tributaries Right: | Betsy Jane Creek, Turmoil Torrent, Tiny Brook, Deep-Down Creek |
The Mueller River is a river of the West Coast Region of New Zealand's South Island. It flows generally north from its sources in the Southern Alps, reaching the Turnbull River 14 kilometres from the latter's mouth. The entire length of the Mueller River is within Mount Aspiring National Park.