The Glen Mills Schools was a youth detention center for juvenile delinquents located near Glen Mills in Thornbury Township, Delaware County, Pennsylvania, United States, for boys between 12 and 21 years of age. The school was founded in 1826 and was the oldest surviving school of its type in the United States until all residents were ordered removed on March 25, 2019, by the Pennsylvania Department of Human Services. The school's licenses were subsequently revoked for not complying with the state's Human Services Code and regulations.

Glen Mills is an unincorporated community in Concord Township, Delaware County, Pennsylvania, United States, located approximately 27 miles west of Philadelphia. The ZIP Code for Glen Mills is 19342.