3J
# 3J

3J may refer to:

* 3J (Family Matters), a character on Family Matters
* 3j symbol or the Wigner 3-jm symbols, symbols in quantum mechanics
* Zip (airline)'s IATA code
* Jubba Airways's IATA code
* $^3J,$ a type of J-coupling involving 3 bonds in nuclear magnetic resonance
