Y6 may refer to: LNER Class Y6, a class of British steam locomotives Neuropeptide Y receptor Y6, a human gene SJ Y6, a series of diesel railcar s operated by Statens Järnvägar (SJ) of Sweden Year 6, like in French Republican Calendar/Y6 A Mazda diesel engines An honors Judaic Studies class at Hillel Yeshiva High School Batavia Air, IATA code Y6 Y-6 may refer to : The Chinese designation for the Ilyushin Il-14 aircraft.