Greycourt State Park is a state recreational facility and historic preserve located in Methuen, Massachusetts. The Greycourt State Park is managed by the Massachusetts Department of Conservation and Recreation.

The Greycourt State Park is a 24 acre public park that is built upon the ruins of the Tenney estate, previously owned by Charles H. Tenney. It was the location of the Tenney Castle or Grey Court, an architecturally unique structure that served as the Tenney Family summer home during the 1890?s. The castle was the centerpoint of the then 75 acre estate and was a popular landmark in the area.

Today the Greycourt State Park offers a variety of recreational activities for its visitors. Popular outdoor recreational activities in the park include nature walks, hiking, nature viewing, bird watching, and even larger activities including concert series, fundraisers, and the city?s annual fall festivals.