J11

J11, J 11 or J-11 can refer to:
* County Route J11 (California), a County route in San Joaquin County, California
* GS&WR Class J11, a Irish 0-6-0 side tank locomotives class
* HMS Bramble (J11), a British Royal Navy
* Junkers J 11, a factory designation of the German 1917 Junkers CL.I ground-attack aircraft
* Shenyang J-11, a 1998 Chinese fighter aircraft
* S/2000 J 11, a prograde irregular satellite of Jupiter

and also :
* Influenza, virus not identified code

See also:
* X3J11, a C programming language ANSI standard-setting committee
* JJ1, Bear JJ1