Water Mill (also called Watermill) is a former Long Island Rail Road station on the Montauk Branch of the Long Island Rail Road.

It was located at the end of a dead-end street off Montauk Highway in Water Mill, New York.

[1] Water Mill station originally opened 1875 on the west side of Halsey Lane (now Old Mill Road), and served the Sag Harbor Branch.

On June 1, 1895, the Long Island Rail Road built the Montauk Extension east of Bridgehampton, New York, transforming the line into the Montauk Branch.

[4] Unlike the nearby Bridgehampton station, which was razed in 1964 and replaced with a shelter in 1968, Water Mill station continues to stand well after it was closed by the Long Island Rail Road, and operated as a restaurant for much of the late-20th Century.