Auburn Heights Preserve is a state park, located in Yorklyn, Delaware, United States. The park, which is around 360 acres, preserves the former home and estate of the Marshall family as well as portions of the family's former mills alongside the Red Clay Creek and additional land purchased by the state. The preserve contains several miles of trails open to walking, biking, and antique cars, and the state owns conservation easements on 160 acres of privately owned land adjacent to the park to help maintain the park's rural character.