Massabesic High School, Pronounced "MASS-UH-BEE-SIK" is a public high school located in Waterboro, Maine, United States. The school is part of the RSU 57 school system, which serves six southwestern Maine towns with a combined population of approximately 22,000 residents: Alfred, Limerick, Lyman, Newfield, Shapleigh and Waterboro. The school is split into two separate buildings: the West Building which serves most of the students in all grades, and the East Building which serves most of the upperclassmen (grades 11 and 12) and special education classes.