AAJ or Aaj may refer to:
- AAJ, IATA airport code for Cayana Airstrip in Suriname
- Aaj Daily, an Urdu publication
- Aaj, an Indian newspaper
- AAJ TV, a television station in Pakistan
- American Alpine Journal, a publication of the American Alpine Club
- American Association for Justice, a U.S. legal organization (formerly Association of Trial Lawyers of America, ATLA)