New Mexico State Road 126

New Mexico State Road 126 (NM 126) is a 39.654 mi state highway in New Mexico, United States. NM 126's western terminus is in the small town of Cuba, at U.S. Route 550 (US 550). The route passes through the Nacimiento Mountains and Jemez Mountains, along the southern boundary of the San Pedro Parks Wilderness, then descends past Fenton Lake to the small, unincorporated community of La Cueva (east of Jemez Springs), where it ends at NM 4.

The highway is a part of the Jemez Mountain Trail National Scenic Byway. It is paved near Cuba and La Cueva, but is a graded dirt road for much of its middle section. This section is usually closed during the winter months, and may be impassable for a few days at other times because of muddy conditions resulting from rainstorms.