JN

JN may mean:
* Jan Mayen: FIPS PUB 10-4 territory code.
* Johnson-Nyquist noise (also thermal noise, Johnson noise or Nyquist noise), the noise generated by the random thermal motion of the electric current carriers inside an electrical conductor.
* the fictional cartoon character Jimmy Neutron but more commonly the show
* Jornal de Notícias, a Portuguese leading newspaper.
* Excel Airways IATA airline designator.

Jn or Jn. may mean:
* Gospel of John