Montemorelos is a city and surrounding municipality of 53,854 inhabitants located in the Northern Mexican state of Nuevo León, in the valley of the Pilon River. It was named after its founder.

The municipality of Montemorelos is located in the central region of Nuevo Leon, near the city of Monterrey. Coordinates for Montemorelos are 25º11' N and 99º50' W.

The area of the municipality is 1,706.2 squared km. The municipality is surrounded by the Madre Oriental and Los Nogales mountain ranges. Montemorelos has several rivers, none of them navigable. The most important rivers located in the municipality are: Ramos, Pilón, Blanquillo, and Potosí rivers.