We document the first breeding record of Mountain Plovers (Charadrius montanus) in the state of Nuevo Leon, Mexico. On 9 July 2004, we located a nest with two eggs and one chick in a colony of Mexican prairie dogs (Cynomys mexicanus). Mean height of vegetation near the nest was 7.1 cm, and bare ground cover was 41.2% (30 m2 sampled). Although this record represents the second nesting for this species in Mexico, it is the first to document successful breeding.