State Road 18 (NM 18) is a state highway in the US state of New Mexico.

Its total length is approximately 72.1 miles (116.0 km).

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.

The entire route is in Lea County.

Media related to New Mexico State Road 18 at Wikimedia Commons