Rahway High School is a four-year public high school that serves students in ninth through twelfth grades from Rahway, in Union County, in the U.S. state of New Jersey, operating as the lone secondary school of the Rahway Public Schools. The high school's present location was built in 1941. The school has been accredited by the Middle States Association of Colleges and Schools Commission on Elementary and Secondary Schools since 1931.

Rahway is a city in southern Union County, in the U.S. state of New Jersey. A bedroom community of New York City, it is centrally located in the Rahway Valley region, in the New York metropolitan area. The city is 15 miles (24 km) southwest of Manhattan and 5 miles (8.0 km) west of Staten Island.