| State: | NE |
| Type: | NE |
| Route: | 40 |
| Map: | Nebraska Highway 40 map.png |
| Map Notes: | Nebraska Highway 40 highlighted in red |
| Length Mi: | 85.72 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Established: | 1933[2] |
| Direction A: | West |
| Terminus A: | in Arnold |
| Junction: | in Miller |
| Direction B: | East |
| Terminus B: | north of Kearney |
| Counties: | Custer, Dawson, Buffalo |
| Previous Type: | NE |
| Previous Route: | 39 |
| Next Type: | NE |
| Next Route: | 41 |
Nebraska Highway 40 is a highway in central Nebraska. It has a length of 85.73miles. It has a western terminus at Nebraska Highway 92 in Arnold and an eastern terminus north of Kearney at an intersection with Nebraska Highway 10.
Nebraska Highway 40 begins in Arnold at an intersection with Nebraska Highway 92. It goes south out of Arnold into farmland and at an intersection with Nebraska Highway 47, turns east. It continues east until Nebraska Spur 21B, a spur road into Callaway, then turns southeasterly. At Oconto, Highway 40 meets Nebraska Highway 21. It continues in a southeasterly direction through Eddyville and Sumner and at Miller, meets U.S. Highway 183. It continues southeast through Amherst and Riverdale and ends north of Kearney at an intersection with Nebraska Highway 10. Much of the alignment of Nebraska Highway 40 from Oconto southeastward to its eastern terminus lies parallel to the Wood River.[1]