Guatay is an unincorporated community in the Cuyamaca Mountains, in the Mountain Empire area of southeastern San Diego County, California.
The town's elevation is 3,999 feet (1,219 m). Although Guatay is unincorporated, it has a post office, with the ZIP code of 91931.
It was the location of a 19th-century stagecoach station on the San Antonio-San Diego Mail Line.
Nearby Guatay Mountain, a peak of the Cuyamaca Mountains, is home to a grove of the rare endemic Tecate Cypress (Cupressus forbesii).