| North Fork Republican River | |
| Name Other: | Wi'hiuniyohe |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Colorado, Nebraska |
| Length: | 55miles |
| Source1 Location: | Yuma County, Colorado |
| Source1 Coordinates: | 39.9994°N -102.4539°W |
| Source1 Elevation: | 3860feet |
| Mouth: | Republican River |
| Mouth Location: | Haigler, Nebraska |
| Mouth Coordinates: | 40.0197°N -101.9383°W |
| Mouth Elevation: | 3241feet |
| Basin Size: | 5086sqmi |
| Custom Label: | Watersheds |
| Custom Data: | North Fork Republican- Republican-Kansas-Missouri- Mississippi |
The North Fork Republican River is a 55.4adj=midNaNadj=mid[1] tributary of the Republican River. It flows eastward from a source in Yuma County, Colorado to just north of Haigler in Dundy County, Nebraska. There it joins with the Arikaree River to form the Republican River.
The North Fork Republican River drains an area of, including, or 87.5%, in eastern Colorado,, or 11.3%, in southwestern Nebraska, and, or 1.2%, in northwestern Kansas.[2]
Use of water from the North Fork Republican River is governed by the Republican River Compact, a water agreement among the U.S. states of Colorado, Nebraska, and Kansas signed on 1942-12-31.