Ciudad Lerdo (Lerdo City) is a small city in the northeastern portion of the Mexican state of Durango. It serves as the municipal seat for the surrounding municipality of the same name.

It is located at co-ordinates 25.33° N, 103.31° W, bordering southeastern Coahuila. As of 2010, the city of Lerdo had a population of 79,669, up from 71,373 people as of 2005. Lerdo Municipality had a population of 141,043. The municipality has an area of 1,868.8 km² (721.5 sq mi). It is part of a greater metropolitan area that includes Torreón Municipality and Matamoros Municipality in Coahuila, as well as Gómez Palacio Municipality in Durango.