1Y or 1-Y may refer to: UH-1Y; see H-1 upgrade program Bell UH-1Y Venom SSH 1Y (WA); see Washington State Route 532 1Y-J, a model of Toyota Y engine 1Y, IATA code for Sun Air (Sudan) 1Y, IATA code for Electronic Data Systems 1-Y classification in the U.S. Selective Service System, no longer in use
See also Year Y1 (disambiguation)