Caumsett State Historic Park is a state recreational park and historic site located in Huntington, New York.

The property on which the state park now stands was first purchased and joined by one Marshall Field III. On the property, he built a 1750 acre estate that he named Caumsett which was the name of the area according to the Matinecock Indian peoples. Field?s estate was a self-sufficient entity with its own electrical and water system and by the time of final completion had facilities for almost all popular estate sports except for golf. The state acquired the property in 1961 and turned it into a state recreational area.

Current activities in the park include fishing and scuba diving with permit, hiking, biking, wildlife viewing, bird watching, nature photography, nature study, and equestrian services.