J9

J9, J09, J 9 or J-9 may refer to:

• Chengdu J-9, a designation assigned to a 1975 Chinese interceptor aircraft that never progressed beyond initial studies
• HMS Cromarty (J09), a 1940 British Royal Navy Bangor-class minesweeper
• Junkers J 9, a factory designation for the 1917 German Junkers D.I fighter aircraft
• Seversky J9, a Swedish WW2 fighter plane

• 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
• Guinee Airlines, a defunct airline of Guinea
• Jazeera Airways, a Kuwaiti airline
• Malaysia Federal Route J9, a major road in Johor, Malaysia
• Peugeot J9, a fullsize van manufactured from 1981 to 2010

• 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

• 9J (disambiguation)