Brooklyn Technical High School, commonly called Brooklyn Tech and administratively designated High School 430, is a public specialized high school in New York City that specializes in science, technology, engineering, and mathematics. It is one of the three original specialized high schools operated by the New York City Department of Education, along with Stuyvesant High School and the Bronx High School of Science. It is the largest high school in the nation.

Admission to Brooklyn Tech involves taking the Specialized High Schools Admissions Test and scoring the cutoff for Brooklyn Tech. Each November, about 30,000 eighth and ninth graders take the 3-hour test for admittance to eight of the nine specialized high schools. About 1,400 to 1,500 students are admitted each year.

Brooklyn Tech counts top scientists, inventors, innovators, Fortune 500 company CEOs and founders, high-ranking diplomats, academic scholars, literary and media figures, professional athletes, National Medal recipients, Nobel laureates, and Olympic medalists among its alumni.