Pascack Hills High School (PHHS) is a four-year comprehensive public high school, one of two secondary schools serving students in ninth through twelfth grade as part of the Pascack Valley Regional High School District in Bergen County, in the U.S. state of New Jersey. Pascack Hills serves the residents of both Montvale, where the campus is located, and the neighboring community of Woodcliff Lake. The other high school in the district is Pascack Valley High School, which serves the communities of Hillsdale and River Vale.

As of the 2023–24 school year, the school had an enrollment of 767 students and 77.2 classroom teachers (on an FTE basis), for a student–teacher ratio of 9.9:1. There were 5 students (0.7% of enrollment) eligible for free lunch and 5 (0.7% of students) eligible for reduced-cost lunch.

The school opened in September 1964, having been built to alleviate crowding at the district's original facility, Pascack Valley High School, which had been opened in 1955. Constructed at a cost of $2.9 million (equivalent to $30.1 million in 2025), the facility was designed with a system of folding walls that could be adjusted to handle student groups of varying sizes. The district received a $12,000 grant from a unit of the Ford Foundation that would allow the school to use IT&T computer systems run by a senior program analyst from that firm that would allow students to select classes on their own. The school spent its first five decades relatively unchanged in terms of architecture. In 2006, an extra gym was added. Most recently, the new science wing was opened as well as a new entrance building. This school is one of the first locally to provide every student with a laptop, which can be taken home, and be used in school every day. Every classroom is fitted with a wireless access point (IEEE 802.11 a/g/n), which provides the students with internet. For the 2007–08 school year, the school upgraded all of its laptop computers to Apple MacBooks.

Pascack Hills High School was the 7th-ranked public high school in New Jersey out of 339 schools statewide in New Jersey Monthly magazine's September 2014 cover story on the state's "Top Public High Schools", using a new ranking methodology. The school had been ranked 18th in the state of 328 schools in 2012, after being ranked 7th in 2010 out of 322 schools listed. The magazine ranked the school 12th in 2008 and was ranked 8th in the magazine's September 2006 issue, which included 316 schools across the state. The school's peak rating by New Jersey Monthly was in 2001 at 2nd. Schooldigger.com ranked the school 46th out of 381 public high schools statewide in its 2011 rankings (a decrease of 29 positions from the 2010 ranking) which were based on the combined percentage of students classified as proficient or above proficient on the mathematics (93.0%) and language arts literacy (97.0%) components of the High School Proficiency Assessment (HSPA).

In its 2013 report on "America's Best High Schools", The Daily Beast ranked the school 345th in the nation among participating public high schools and 27th among schools in New Jersey.

In the 2011 "Ranking America's High Schools" issue by The Washington Post, the school was ranked 62nd in New Jersey and 1,782nd nationwide. In Newsweek's May 22, 2007 issue, ranking the country's top high schools, Pascack Hills High School was listed in 1194th place, the 40th-highest ranked school in New Jersey.

As of February 2024, U.S. News & World Report ranked Pascack Hills as the No. 968 High School nationwide, and No. 42 within New Jersey.

As of February 2024, Niche (company) ranked Pascack Hills as the No. 95 public school within New Jersey.