Captree is a census-designated place (CDP) 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.

The eastern two-thirds of the CDP are in the town of Islip, while the one-third of the CDP that occupies the portion of Captree Island west of the Robert Moses Causeway is in the town of Babylon.

The Robert Moses Causeway connects Captree and Jones Beach islands with West Islip, 6 miles (10 km) to the north on Long Island.

Ocean Parkway runs west from Captree through Oak Beach and Gilgo, leading 14 miles (23 km) to Jones Beach State Park.