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
- The 3 J's, Dallas Mavericks stars Jason Kidd, Jim Jackson, and Jamal Mashburn
- Triple J
- JJJ (disambiguation)
- J3 (disambiguation)
|This disambiguation page lists articles associated with the same title formed as a letter-number combination.
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