Aja may refer to

1. An Orisha in Yoruba mythology. See Aja (Yoruba mythology)
2. A group of people living in Benin. See Aja (people).
3. The language of the Aja people, part of the Gbe dialect continuum. See Aja-Gbe language .
4. A language spoken in Sudan. See Aja language.
5. See Aja (Hindu mythology)
6. A Steely Dan album, see Aja (album)