Prospect High School, commonly known as Prospect, is a public four-year high school located in Mount Prospect, Illinois, United States. It is part of Township High School District 214, one of the largest high school districts in Illinois, which also encompasses Buffalo Grove High School, Elk Grove High School, John Hersey High School, Rolling Meadows High School, and Wheeling High School. The school serves students from central Mount Prospect and a significant portion of eastern Arlington Heights near the Mount Prospect village limits. Its primary feeder schools include Lincoln Middle School, South Middle School, Friendship Junior High School, and Holmes Junior High School. Established to meet the growing educational needs of the suburban Chicago area, Prospect High School offers a comprehensive curriculum including advanced placement courses, vocational programs, and extracurricular activities such as sports, arts, and clubs.

The school has a reputation for academic excellence and community involvement, with a student body that reflects the diverse demographics of the northwest suburbs of Chicago. Notable alumni include conservative activist Charlie Kirk, who graduated in 2011 and went on to found Turning Point USA. Prospect High School emphasizes college preparation, with high graduation rates and strong performance on state assessments. The campus features modern facilities, including a performing arts center and athletic fields, supporting a wide range of programs that foster student development. As a public institution, it is funded through local property taxes and state aid, operating under the governance of the District 214 board.

Throughout its history, Prospect High School has been involved in various community initiatives and has occasionally faced typical public education challenges such as budget constraints and demographic shifts. It maintains a commitment to inclusivity and equity in education, participating in district-wide efforts to support underrepresented students.