Captree is a census-designated place in the towns of Islip and Babylon in Suffolk County, New York, United States. It occupies Captree Island in Great South Bay, as well as the east end of Jones Beach Island to the south, comprising Captree State Park. It was first listed as a CDP prior to the 2020 census. Prior to that it was part of the Oak Beach–Captree CDP. The community is in southwestern Suffolk County, on two islands that lie between Long Island to the north and Fire Island to the south.