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
See also J9 (disambiguation)