Río Bec is a Pre-Columbian Maya archaeological site located in what is now southern portion of the Mexican state of Campeche. The name also refers to an architectural style (Río Bec Style) that first appeared at Río Bec and subsequently spread to other nearby sites. The Río Bec Style is closely related to the Chenes architectural style found northwest of the Río Bec region.

The Río Bec site was first mentioned by Austrian explorer Teoberto Maler at the end of the 19th century, though he never visited the site. The French explorer Maurice de Perigny was the first European to visit and report on the Río Bec. The site is now being excavated and restored by a group of French archaeologists from the CNRS headed by Dominique Michelet. They have located several architectural groups and their surveys and maps of several square kilometers give us a better understanding of the ancient settlement. Excavation of the principal building at Río Bec A, a building with three towers and several rooms, is now underway.