C.A. McMillen High School, commonly known as McMillen High School, McMillen, or MHS, is a secondary school serving grades nine and ten, located in the East Cluster of the Plano Independent School District. Murphy Middle School and Armstrong Middle School feed into McMillen. Students graduating from McMillen will attend Plano East Senior High School for the eleventh and twelfth grades. In 2015, the school was rated "Met Standard" by the Texas Education Agency.