Eastside High School (or EHS) is a four–year public high school located in Paterson section of Passaic County, in the U.S. state of New Jersey, that serves the eastern section of Paterson. EHS, which serves ninth through twelfth grade students, operates as part of the Paterson Public Schools. The school has been accredited by the Middle States Association of Colleges and Schools Commission on Elementary and Secondary Schools since 1928. Eastside High School opened on February 1, 1926.

As of the 2024–25 school year, the school had an enrollment of 2,073 students and 130.0 classroom teachers (on an FTE basis), for a student–teacher ratio of 16.0:1. There were 1,183 students (57.1% of enrollment) eligible for free lunch and 26 (1.3% of students) eligible for reduced-cost lunch.

The school mascot—the Ghosts—derives from the location of Eastside's football field, where a nineteenth-century cemetery once stood. A May 1927 article in The Paterson Evening News refers to the Eastside team as the "Galloping Ghosts".