Buchanan Dam (/bəkˈhænən/ bək-HAN-ən) is a census-designated place (CDP) in Llano County, Texas, United States.

Texas State Highway 29 passes through the southern part of the CDP, crossing the Colorado River just south of the Buchanan Dam.

[1] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

[5] As of the 2020 United States census, there were 1,508 people, 642 households, and 451 families residing in the CDP.

Buchanan Dam is served by the Burnet Consolidated Independent School District.