6J

6J or 6-J can refer to:


 * IATA code for Solaseed Air (Ex Skynet Asia Airways)
 * 6-j symbol
 * 6J, a model of SEAT Ibiza
 * Hughes MH-6J, model of Hughes OH-6 Cayuse
 * AH-6J, a model of MD Helicopters MH-6 Little Bird
 * AS.6J, a model of Airspeed Envoy
 * 6J, designator for Clatskanie School District
 * 6J6, see List of caves in Western Australia
 * WS-6J, engine model in Xian H-6
 * CA-6J, a model of Buhl Airsedan
 * RE-6J, or Burlington Public School District; see Table of Colorado school districts
 * T-6J, one of the North American T-6 Texan variants
 * 6J, the production code for the 1983 Doctor Who serial The King's Demons