The Fire Island Lighthouse is a visible landmark on the Great South Bay, in southern Suffolk County, New York on the western end of Fire Island, a barrier island off the southern coast of Long Island. The lighthouse is located within Fire Island National Seashore and just to the east of Robert Moses State Park. It is part of the Fire Island Light Station which contains the light, keepers quarters, the lens building containing the original first-order Fresnel lens, and a boat house.