Granbury High School is a public high school located in the city of Granbury, Texas, United States and classified as a 5A school by the University Interscholastic League (UIL). It is part of the Granbury Independent School District which serves students grades 9–12 from Granbury, Hood County along with portions of Johnson County and Parker County. The school was founded around 1870 at a different location. The present high school was built in the 1970s at its current location. It was the first public school in Hood County. In 2015, the school was rated "Met Standard" by the Texas Education Agency.

Granbury is a city in and the county seat of Hood County, Texas, United States. As of the 2020 census, the city's population was 10,958, and it is the principal city of the Granbury micropolitan statistical area. Granbury is named after Confederate General Hiram B. Granbury.