thumb|View of San Carlos Bay, Sonora

San Carlos is a beachfront subdivision within the port city of Guaymas, but is considered its own town in the northern state of Sonora in Mexico. It is known for the clarity and warmth of the ocean water in its shallow bays. It lies on the Sea of Cortez. Given the size of the city, with nearly 7,000 inhabitants, there is a large number of RV Parks, resorts and stores available. There is also an active diving community. Many Americans and Canadians live in San Carlos during the winter months. The summer months are very hot and humid. Fishing, Scuba diving, and beach activities can be pursued here.

thumb|Tetakawi

The community of San Carlos was founded on land that previously was a large cattle ranch known as the Baviso de Navarro. This was later subdivided in four great estates known as Rancho Los Algodones, Rancho San Carlos, Rancho El Baviso and Rancho El Represo. In the mid-1950s, Mr. Rafael T. Caballero acquired the ranches Los Algodones, San Carlos and El Baviso, contracting the services of City planners who designed the first stages of a gradual and carefully planned tourist development that in time would become one of the first and most important tourist and recreational communities in the State.