| Cascade River | |
| Pushpin Map: | New Zealand South Island#New Zealand |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Cascade River |
| Source1: | Confluence of Limbo Stream and Retreat Creek |
| Source1 Coordinates: | -44.0434°N 169.2193°W |
| Mouth Location: | Haast River |
| Mouth Elevation: | 0m (00feet) |
| Mouth Coordinates: | -44.0256°N 169.3619°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | West Coast Region |
| Subdivision Type3: | District |
| Subdivision Name3: | Westland |
| Length: | 67km (42miles) |
| Progression: | Cascade River → Tasman Sea |
| Tributaries Left: | Barrington Creek, Granite Creek, Saddle Creek, Kappa Creek, Delta Creek, Gamma Creek, Beta Creek, Colin Creek, Eel Creek, Barn River |
| Tributaries Right: | Holland Creek, Malcolm Creek, Arcade Creek, Captains Creek, Falls Creek, McKay Creek, Woodhen Creek, Martyr River, The Old Man |
The Cascade River is a river of the South Island of New Zealand. It flows north for 30km (20miles) from its source in Mount Aspiring National Park in the Southern Alps, forming a deep valley between the Olivine Range and Red Hills Range. From the end of this valley it turns west to cross a low-lying swampy floodplain before entering the Tasman Sea close to Cascade Point, a headland halfway between Big Bay and Jackson Bay.