Tucumcari Mountain is a mesa just outside of Tucumcari, New Mexico. The town was founded in 1901 and officially took the mountain's name in 1908.

The mountain is one of Route 66's most recognized landmarks. It is the inspiration for the mesa near the fictional town of Radiator Springs in the animated movie, Cars. Even the RS for Radiator Springs on the side of the mountain matches the large, painted letter T on Tucumcari Mountain.