Governor Thomas Johnson High School (GTJHS) is a four-year public high school in Frederick, Maryland, United States. The school is home to the Academy of Fine Arts, an auditioned-only visual and performing arts program for talented students in Frederick County from Grades 9th to 12th. The school is also home to the naval Junior Reserve Officers' Training Corps for Frederick County.

Thomas Johnson was an 18th-century American lawyer, politician, and patriot. He was a delegate to the First Continental Congress in 1774, where he signed the Continental Association; commander of the Maryland militia in 1776; and elected first (non-Colonial) governor of Maryland in 1777. Throughout his career, Johnson maintained a personal and political friendship with George Washington, who gave him a recess appointment as an associate justice of the Supreme Court in August 1791. He served only briefly, resigning in January 1793, citing health issues.