DJJ
DJJ may refer to:

 Dortheys Hiyo Eluay International Airport (IATA airport code DJJ), Jayapura, Papua, Indonesia
 Ndjébbana language (ISO 639 language code djj)
 Department of Juvenile Justice (disambiguation)
 Dunakeszi Jármű Javító, a division of Transmashholding

See also

 China Railway DJJ1, a high-speed electric multiple unit train class
 
 DJ (disambiguation)
 DDJ (disambiguation)
 JJD
 JDD (disambiguation)