Aja or AJA may refer to:

• AJ Auxerre, a French football club
• Ajaccio Napoleon Bonaparte Airport's IATA airport code
• Al Jazeera America, an American news channel
• American Jewish Archives
• American Journal of Archaeology
• Arbeitskreis gemeinnütziger Jugendaustauschorganisationen, a German organization of non-profit youth exchange groups
• The Association of Japanese Animations
• Australian Journalists Association, part of the Media, Entertainment and Arts Alliance

• Aja people, a people living in Benin
  • Aja language (Niger–Congo), the language of the Aja people, part of the Gbe dialect continuum
• Aja people (South Sudan), an ethnic group living in South Sudan
  • Aja language (Nilo-Saharan), a language spoken in Sudan

• Aja (Hindu mythology), a prince of the Ikshvaku dynasty
• Aja (orisha), or Ajija, a Yoruba spirit of the whirlwind
• Aja, another name of the Hindu god Shiva

• Aja (album), a 1977 Steely Dan album
  • "Aja" (song), the title track of that album
• Aja!, a 2015 Maija Vilkkumaa album
• Aja Ireland, a music producer

• Aja (name)

• Aja Mountain, a mountain in Ha'il, Saudi Arabia
• Ajjah, a Palestinian village in the Jenin Governorate in the northern West Bank

• All pages with titles beginning with AJA
• All pages with titles beginning with Aja
• All pages with titles containing Aja
• アジャ (disambiguation)