Phillipsburg High School is a comprehensive, four-year public high school located in Phillipsburg, in Warren County, in the U.S. state of New Jersey. The school was first established in 1871. For this reason, the school's nickname is the "Stateliners." The school has been accredited by the Middle States Association of Colleges and Schools Commission on Elementary and Secondary Schools since 2000.The school is part of the Phillipsburg School District, one of 31 former Abbott districts statewide that were established pursuant to the decision by the New Jersey Supreme Court in Abbott v. Burke which are now referred to as "SDA Districts" based on the requirement for the state to cover all costs for school building and renovation projects in these districts under the supervision of the New Jersey Schools Development Authority. The district serves students from Phillipsburg and from five other municipalities: Alpha, Bloomsbury (in Hunterdon County), Greenwich Township, Lopatcong Township and Pohatcong Township, who attend as part of sending/receiving relationships.The site of the new Phillipsburg High School, which began construction in January 2014, is in Lopatcong Township. The three-story, 330,000-square-foot (31,000 m2) building, with more than double the floor space of the existing high school and a capacity to accommodate more than 2,100 students, was completed for the 2016–17 school year and was dedicated in September 2016 at ceremonies attended by Governor of New Jersey Chris Christie. Phillipsburg High School's enrollment had been in excess of the school's capacity. To compensate for this, the Phillipsburg School District purchased or leased 31 trailers.
As of the 2021–22 school year, the school had an enrollment of 1,809 students and 133.5 classroom teachers (on an FTE basis), for a student–teacher ratio of 13.6:1. There were 429 students (23.7% of enrollment) eligible for free lunch and 36 (2.0% of students) eligible for reduced-cost lunch.