New York State Route 135 (NY 135) is a 10.8-mile (17.4 km) state highway in eastern Nassau County, New York, in the United States. The route is a limited-access highway that connects Seaford with Syosset. The highway runs from Merrick Road (unsigned County Route 27 or CR 27) in Seaford to NY 25 in Syosset. In between, NY 135 passes through Bethpage and Plainview and serves Bethpage State Park. The highway is ceremoniously designated as the Ralph J. Marino Expressway; however, it is more commonly known as the Seaford–Oyster Bay Expressway.