KAJA may refer to:
- KAJA (FM), a radio station (97.3 FM) licensed to San Antonio, Texas, United States
- K68DJ, a television station (channel 68) licensed to Corpus Christi, Texas, United States, unofficially known as KAJA
- Kajagoogoo, a British pop band known as Kaja for a brief period of time.
- Vesna Milačić Kaja, a Montenegrin singer and songwriter
- Kaja Foglio, a fantasy and comic book artist, who has done several pieces for Magic: the Gathering