Mount Rainier High School is a secondary school in Des Moines, Washington, United States; named for Mount Rainier which can be seen quite well from the school on a clear day. Mount Rainier serves approximately 1700 students and has been active since 1957. It was created to handle the overflow from nearby Highline High School, the district's first high school located in Burien, Washington. The original, aging facility was replaced with a new building at the same location; it opened in September 2007.