Williamstown High School is a four-year comprehensive community public high school located in the Williamstown section of Monroe Township in Gloucester County, New Jersey, United States, serving students in ninth through twelfth grades as the lone secondary school of the Monroe Township Public Schools. The school was established in 1958.As of the 2013-14 school year, the school had an enrollment of 1,814 students and 126.4 classroom teachers (on an FTE basis), for a student–teacher ratio of 14.4:1. There were 399 students (22.0% of enrollment) eligible for free lunch and 124 (6.8% of students) eligible for reduced-cost lunch.Construction on the current school building began in 1994 and was completed in 1997. Prior to 1997, Williamstown High School was located in what is currently Williamstown Middle School. The school mascot is a Brave and the school colors are Royal Blue and White.Construction began again during the 2007-2008 school year on the high school to build an additional two wings because of overcrowding and to build a new auxiliary gym/dance studio. A few renovations in the existing building were also done to replace some old piping, wiring, and the gym and stage floor. The construction was completed between December 2008 and January 2009.