| Nigu River | |
| Map Size: | 300 |
| Pushpin Map: | USA Alaska |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the Nigu River in Alaska |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Alaska |
| Subdivision Type4: | Borough |
| Subdivision Name4: | North Slope, Northwest Arctic |
| Length: | 70miles |
| Source1: | Imakturok Pass |
| Source1 Location: | Brooks Range, Northwest Arctic Borough |
| Source1 Coordinates: | 67.8691°N -155.2875°W[1] |
| Mouth: | Etivluk River |
| Mouth Location: | 25miles northwest of Howard Pass, North Slope Borough |
| Mouth Coordinates: | 68.5408°N -156.4533°W |
The Nigu River is a 70miles tributary of the Etivluk River in the U.S. state of Alaska.[1] Arising on the north slope of the Brooks Range just west of Gates of the Arctic National Park and Preserve, the Nigu flows generally northwest to meet the Etivluk about 25miles northwest of Howard Pass.[2] The Nigu flows through some of the most remote locations in northern Alaska for its entire length.