| Rapid River | |
| Name Etymology: | Named because of the "boulder stream rapids that extend three quarters of a mile up stream from its mouth." |
| Pushpin Map: | Alaska |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of Rapid River in Alaska |
| Subdivision Type1: | Countries |
| Subdivision Type2: | Territory |
| Subdivision Name2: | Yukon |
| Subdivision Type3: | State |
| Subdivision Name3: | Alaska |
| Length: | 75km (47miles) |
| Source1: | Lahchah Mountain |
| Source1 Location: | Northwest Yukon, Yukon, Canada |
| Source1 Coordinates: | 67.7036°N -140.7169°W |
| Source1 Elevation: | 745m (2,444feet) |
| Mouth: | Porcupine River |
| Mouth Location: | Yukon–Koyukuk Census Area, Alaska, United States |
| Mouth Coordinates: | 67.2769°N -141.6328°W |
| Mouth Elevation: | 197m (646feet) |
The Rapid River is a river in Yukon, Canada and Alaska, United States.
The stream was published as Sucker River by the U.S. Coast and Geodetic Survey (USC&GS) in 1890. The current name was mentioned by R. G. McConnell of the Geological Survey of Canada in 1888. It was so named because of the "boulder stream rapids that extend three quarters of a mile up stream from its mouth."
The source of the Rapid River is on the slopes of Lahchah Mountain at an elevation of 745m (2,444feet), about 40km (30miles) northwest of Old Crow. The river travels 15km (09miles) west to reach the United States border, where it crosses into Yukon–Koyukuk Census Area, Alaska at 67.6417°N -141°W at an elevation of 476m (1,562feet). The river reaches its mouth at the Porcupine River at an elevation of 197m (646feet), 12.8km (08miles) north of the settlement of Old Rampart.