1Y

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