Greycourt State Park is a public recreation area covering 24 acres (9.7 ha) atop the partially restored ruins of the Charles H. Tenney estate in Methuen, Massachusetts.

[1] The construction of Grey Court, also known as the Tenney Castle, was begun in 1890 and completed in 1892.

[2][3] The mansion, which was modeled after the Château d'Yquem, stood on the hilltop until it was destroyed by fire in 1978.

In 2001, the Massachusetts legislature approved $1,750,000 for the rehabilitation and repair of Greycourt State Park, including public safety improvements and courtyard renovations.

[5] The park offers wooded walking trails and scenic landscape from dawn to dusk and hosts city activities such as the annual Fall Festivals and other events.