Troy High School is a public high school in Fullerton, California, U.S., acclaimed for its many programs including the flagship Troy Tech, Cambridge Diploma, and International Baccalaureate. The school is part of the Fullerton Joint Union High School District. As of the 2022-23 school year, 2,584 students attend the school. The school is located next to the continuing La Vista High School and California State University, Fullerton.