Mullen High School, home of the Mustangs, is a public school located in Denver, Colorado. MHS is a Roman Catholic, Brothers of the Christian Schools, college-preparatory high school with approximately 900 students and 24 varsity sports. In the tradition of St. John Baptist de La Salle and the Brothers of the Christian Schools, Mullen High School is a Catholic, college preparatory high school whose graduates embrace God’s gift of learning, devote their lives to seeking ceaselessly for His learning, and commit themselves to using His learning in the service of others.