HJ. hj or Hj can refer to:
- Mathematics and science
- HJ, Hall–Janko group, a mathematical group
- HJ, Heterojunction, the interface between two layers of dissimilar crystalline semiconductors
- Initialisms
- HJ, Hilal-i-Jurat, the second highest military award of Pakistan
- HJ, Hitler-Jugend, the German name for the Hitler Youth
- HJ, a latin abbreviation for hic jacet ('Here lies'), commonly used on gravestones. See List of Latin phrases (H)
- Other
- Hj. (Hajji), an Islamic honorific
- 'The HJ', Halliwell Jones Stadium, a stadium in Warrington, England
- HJ, U.S. code word for a cryptographic key change (see Cryptoperiod)
- The IATA airline designator for Tasman Cargo Airlines
- Holden HJ, An Australian full sized car produced between 1974 & 1976
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