New York State Route 101 (NY 101) is a 3.58-mile (5.76 km) long state highway in northwestern Nassau County, New York, in the United States. It runs north–south as Port Washington Boulevard from NY 25A in Flower Hill, west of Roslyn and east of Manhasset, to Astor Lane in Sands Point. It becomes County Route 101 (CR 101) south along Searingtown Road to Shelter Rock Road (CR 8) and becomes Middle Neck Road north of Astor Lane, continuing north and west to a dead end at the Long Island Sound as the unsigned County Route D55 (CR D55).
Middle Neck Road in Flower Hill in 2022.