Thomas Jefferson High School for Science and Technology (also known as TJHSST, Thomas Jefferson, or TJ) is a Virginia state-chartered magnet high school in Fairfax County, Virginia operated by Fairfax County Public Schools. The school occupies the building of the previous Thomas Jefferson High School, constructed in 1964. A selective admissions program was initiated in 1985 through the cooperation of state and county governments and corporate sponsorship from the defense and technology industries. It is one of 18 Virginia Governor’s Schools, and a founding member of the National Consortium for Specialized Secondary Schools of Mathematics, Science and Technology.
Attendance at the school is open to students in six local jurisdictions based on academic achievement described in the Student Portrait Sheet—a compilation of 4 essays, problem-solving skills—assessed by the Problem Solving Essay, an unweighted grade-point average consisting of 7th grade final grades—8th grade first quarter grades—and summer grades, and socio-economic background. Before the 2020–21 school year, the admissions process also involved a math, reading, and science exam.