Jaa or JAA can refer to the following:
- Joint Aviation Authorities, European aviation regulatory agency
- Japan Asia Airways, For Japan Asia Airways
- Jaa (food), staple food of the Newars people in Nepal.
- Tony Jaa, Thai martial art film actor
- Jaaa, song by artist "Die Fantastischen Vier" from their album " Vier gewinnt"
- Jaa, Punjabi song by Dakssh Ajit Singh 'n' Mannat Singh released by Tasbee Muzic