J4

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J4/J04, J-4/J-04 or J.4/J.04 may refer to:

In science and academia 
In military 
  • Mikoyan-Gurevich MiG-15, Chinese designation of this Soviet-made aircraft is J-4
  • HMAS J4, an Australian Royal Navy submarine which saw service during World War I
  • Junkers J 4, a 1917 German sesquiplane format warplane
  • J4F was the U.S. Navy's designation for the Grumman Widgeon seaplane.
In transportation 
Other