Mira Costa High School (MCHS, "Costa") is a four-year public high school located in Manhattan Beach, California, United States that first began operating in 1950. It is the only high school in the Manhattan Beach Unified School District. The school's athletic teams are known as the Mustangs and the school colors are green and gold. As of the 2005–06 school year, the school had an enrollment of 2,323 students and 98.0 classroom teachers (on an FTE basis), for a student-teacher ratio of 23.7.