| State: | NM |
| Type: | SR |
| Route: | 540 |
| Map Custom: | yes |
| Map Notes: | NM 540 highlighted in red |
| Length Mi: | 4.4 |
| Length Ref: | [1] |
| Direction A: | West |
| Terminus A: | End of state maintenance near Logan |
| Direction B: | East |
| Terminus B: | in Logan |
| Counties: | Quay |
| Previous Type: | NM |
| Previous Route: | 539 |
| Next Type: | NM |
| Next Route: | 542 |
State Road 540 (NM 540) is a 4.4adj=midNaNadj=mid state highway in the US state of New Mexico. NM 540's western terminus is at the end of state maintenance west of Logan, and the eastern terminus is at U.S. Route 54 (US 54) in Logan.