Greely High School is a public high school for grades 9 to 12 located in Cumberland, Maine, United States. The enrollment is approximately 715 students. It also has a professional teaching staff of 64 and 50% of the teachers have advanced degrees. Greely High School is a part of Maine School Administrative District 51, which serves the towns of Cumberland and North Yarmouth. The school completed a 10-million-dollar addition/renovation in 2009.