Seaford High School is a public high school located in Seaford, New York, United States serving students in the ninth through twelfth grades. It is in the Seaford Union Free School District. As of the 2014–15 school year, the school had an enrollment of 756 students and 61.6 classroom teachers (on an FTE basis), for a student–teacher ratio of 12.3:1. There were 43 students (5.7% of enrollment) eligible for free lunch and 22 (2.9% of students) eligible for reduced-cost lunch.