Thomas Jefferson High School was an all-boys public high school in Elizabeth, in Union County, New Jersey, United States, which operated as part of the Elizabeth Public Schools. The school opened in 1929 at which time Battin High School became an all-girls school. The school operated on a single-sex basis for 48 years until the end of the 1976–77 school year, ending its status as one half of the state's only pair of public high schools operated separately for male and female students. The building now hosts the Admiral William Halsey Leadership Academy and the John E. Dwyer Technology Academy.