Mountlake Terrace High School is a public high school located in Mountlake Terrace, Washington, United States. Mountlake Terrace HS is known for its Jazz Band and basketball program, which has won the Wesco Championship 8 times. It is the third largest high school in the Edmonds School District. Mountlake Terrace HS participates in the Washington Interscholastic Activities Association, having reclassified from 3A to 2A at the start of 2016–2017 school year.