| State: | NM |
| Type: | SR |
| Route: | 42 |
| Map Custom: | yes |
| Length Mi: | 35.542 |
| Length Ref: | [1] |
| Direction A: | South |
| Direction B: | North |
| Terminus B: | in Willard |
| Terminus A: | in Corona |
| Counties: | Lincoln, Torrance |
| Previous Type: | NM |
| Previous Route: | 41 |
| Next Type: | NM |
| Next Route: | 45 |
State Road 42 (NM 42) is a state highway in the US state of New Mexico. Its total length is approximately 35.5miles. NM 42's southern terminus is in the village of Corona, at U.S. Route 54 (US 54) and NM 42's northern terminus is in the village of Willard, at US 60.