J9, J09, J 9 or J-9 may refer to:
Military Chengdu J-9, a designation assigned to a 1975 Chinese interceptor aircraft that never progressed beyond initial studies , a 1940 British Royal Navy Junkers J 9, a factory designation for the 1917 German Junkers D.I fighter aircraft Seversky J9, a Swedish WW2 fighter plane
Transport County Route J9 (California), a main route between the cities of Oakdale, Waterford, and Turlock GS&WR Class J9, a Great Southern and Western Railway steam locomotive Jazeera Airways, a Kuwaiti airline Johor State Route J9, a major road in Johor, Malaysia Peugeot J9, a fullsize van manufactured from 1981 to 2010
Other uses J9 (album), a 2004 album by Jolin Tsai J9 Series, a trilogy of Japanese anime robot series Elongated pentagonal pyramid (J9), a Johnson solid IBM J9, an implementation of Java S/2000 J 9, now called Taygete, a retrograde irregular satellite of Jupiter S/2001 J 9, now called Orthosie, a natural satellite of Jupiter S/2003 J 9, a retrograde irregular satellite of Jupiter
See also 9J (disambiguation)