Glastonbury High School is a public, co-educational high school located in Glastonbury, Connecticut, United States.

Glastonbury is a town in the Capitol Planning Region, Connecticut, United States, formally founded in 1693 and first settled in 1636. It was named after Glastonbury in Somerset, England. Glastonbury is on the banks of the Connecticut River, 7 miles (11 km) southeast of Hartford. The town center is defined by the U.S. Census Bureau as a census-designated place (CDP). The population was 35,159 at the 2020 census.