9J

9J or 9-J can refer to:


 * 9-j symbol
 * IATA code for Dana Air
 * New York State Route 9J
 * Le Rhône 9J
 * AIM-9J, a model of AIM-9 Sidewinder
 * F-9J, a model of Grumman F-9 Cougar
 * GCR Class 9J, a class of British 0-6-0 steam locomotive
 * France's Rotary Engine Le Rhone 9J