Y6

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.