Cliffside Park High School is a four-year comprehensive public high school that serves students in ninth through twelfth grade from Cliffside Park, in Bergen County, in the U.S. state of New Jersey, operating as the lone secondary school of the Cliffside Park School District.

Students from Fairview attend the school as part of a sending/receiving relationship with the Fairview Public Schools.

As of the 2024–25 school year, the school had an enrollment of 1,314 students and 94.0 classroom teachers (on an FTE basis), for a student–teacher ratio of 14.0:1. There were 821 students (62.5% of enrollment) eligible for free lunch and 102 (7.8% of students) eligible for reduced-cost lunch. In the 2011–12 school year, 36.1% of students at the high school spoke English as their first language at home, while 44.4% spoke Spanish, 4.4% speak Arabic, 3.8% speak Portuguese, 1.9% speak Korean, 1.9% speak Turkish and 7.6% speak other languages. Among the graduates of the Class of 2010, 51.2% planned to attend four-year colleges, while 38.5% planned on attending two-year colleges.