Elwyn is an unincorporated community located in Middletown Township, Delaware County, Pennsylvania, United States. Elwyn has a latitude of 39.907N, longitude of -75.41W and a mean elevation of 253 feet above sea level. Elwyn is home to Elwyn Inc., a facility caring for the needs of the developmentally disabled and disadvantaged. Elwyn is named for Dr. Alfred L. Elwyn, a physician who founded The Pennsylvania Training School for Feeble-minded Children in 1852 with teacher James B. Richards.