Hempstead High School is a public high school located in Hempstead, New York, United States. It is the Hempstead Union Free School District's only high school.

As of the 2014–15 school year, the school had an enrollment of 2,226 students and 116.0 classroom teachers (on an FTE basis), for a student–teacher ratio of 19.2:1. There were 1,346 students (60.5% of enrollment) eligible for free lunch and 34 (1.5% of students) eligible for reduced-cost lunch.