Red Hook is a town in Dutchess County, New York, United States. The population was 9,953 at the time of the 2020 census, down from 11,319 in 2010. The name is supposedly derived from the red foliage on trees on a small strip of land on the Hudson River. The town contains two villages, Red Hook and Tivoli. The town is in the northwest part of Dutchess County. The town also contains two hamlets. Bard College is in the hamlet of Annandale-on-Hudson. The Unification Theological Seminary is in the hamlet of Barrytown. Both hamlets are located within the Hudson River Historic District.