Richmond Hill High School (RHHS) is a secondary school located in the city of Richmond Hill, Ontario, Canada. It is the second-oldest high school in York Region Municipality (behind Newmarket High School c. 1843), being established in the mid-19th century. The school is a host to several regional special education programs, including an Advanced Placement Program, Alternative Education Program, Cooperative Education Program, Developmentally-Delayed Program, Multiple Exceptionalities Program, and a High Performance Athlete Program. The school has a gifted program along with all other secondary schools in York Region.

In the 2024–2025 Fraser Institute rankings, Richmond Hill High School ranked 28th in the province of Ontario, with an overall score of 8.8/10.