Prospect High School, or Prospect, is a public four-year high school in Mount Prospect, Illinois, United States. It is part of Township High School District 214, which also includes Buffalo Grove High School, Elk Grove High School, John Hersey High School, Rolling Meadows High School, and Wheeling High School. It serves central Mount Prospect and a large portion of east Arlington Heights close to the Mt. Prospect village limits. Its feeder schools are Lincoln Middle School, South Middle School, Friendship Junior High School and Holmes Junior High School.

Mount Prospect is a village in Elk Grove Village and Wheeling Townships in Cook County, Illinois, about 20 miles (32 km) northwest of downtown Chicago, and approximately 4 miles north of O'Hare International Airport. As of the 2020 census, the village had a total population of 56,852.