New York State Route 109 (NY 109), also known as the Babylon–Farmingdale Turnpike and historically as Maywood–Babylon Road, is a four-lane state highway on Long Island, in New York, United States. It runs from the Village of Farmingdale in the Nassau County town of Oyster Bay to the Village of Babylon in Suffolk County. It runs mainly west-to-east in a northwest to southeast direction.

The Town of Oyster Bay is the easternmost of the three towns that make up Nassau County, New York, United States. Part of the New York metropolitan area, it is the only town in Nassau County to extend from the North Shore to the South Shore of Long Island. As of the 2020 census, it had a population of 301,332, Making it the 5th most populous city or town in the state.