| State: | NM |
| Type: | SR |
| Route: | 18 |
| Map Custom: | yes |
| Map Notes: | NM 18 highlighted in red |
| Length Mi: | 72.117 |
| Length Ref: | [1] |
| Direction B: | North |
| Terminus B: | in Lovington |
| Junction: | in Hobbs |
| Direction A: | South |
| Terminus A: | near Jal |
| Counties: | Lea |
| Previous Type: | NM |
| Previous Route: | 17 |
| Next Type: | NM |
| Next Route: | 19 |
State Road 18 (NM 18) is a state highway in the US state of New Mexico. Its total length is approximately 72.1miles. NM 18's southern terminus is a continuation as Texas State Highway 18 (SH 18) south-southeast of Jal, and the northern terminus is at U.S. Route 82 and NM 83 in Lovington.