New Mexico State Road 126 (NM 126) is a 39.654-mile-long (63.817 km) state highway in New Mexico, United States of America. 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.