EJ can mean:
- East Jerusalem
- Encyclopaedia Judaica
- Environmental Justice
- exajoule, an SI unit of energy equal to 1018 joules
- Electronic Journalism, an old name for electronic news gathering
- Elton John
- Eric Johnson
- Eddie Jordan
- the ITU prefix for radio operators on Ireland's coastal islands
- The IATA code for New England Airlines
- EJ Holden, An early Holden car
- External jugular vein
- EJ Wells, a fictional character from the soap opera Days of our Lives.
- The Economic Journal, the journal of the Royal Economic Society
- eJay, a music software program
- Ernie Johnson, Jr., a sports broadcaster for Turner Network Television
- E. James Tull, a shipbuilder from Pocomoke City, Maryland
- Expansion Joint, Architectural/Mechanical/Structural terms
- EJ engine series, manufactured by Subaru
- E&J, short for E & J Gallo Winery