Aga
- AGA (automobile)
- AGA (singer)
- AGA AB
- AGA Rangemaster Group
- AGA cooker
- Abellio Greater Anglia
- Aegea
- Aga (Ottoman Empire)
- Aga (bird)
- Aga (bug)
- Aga (river)
- Aga Ashurov
- Aga Khan (disambiguation)
- Aga Muhlach
- Aga Point
- Aga Radwańska
- Aga Zaryan
- Aga of Kish
- Aga saga
- Aga vom Hagen
- Aga, Egypt
- Aga, Niigata
- Agadir–Al Massira Airport
- Agafa
- Agafangel
- Agafon
- Agafonik
- Agap
- Agapa
- Agapit
- Agapiya
- Agatha (given name)
- Agav
- Agavva
- Agga (disambiguation)
- Agha (disambiguation)
- Aguano language
- Alcohol and Gaming Authority
- Alejandro G. Abadilla
- Alemu Aga
- Alte Gesamt-Ausgabe
- American Gaming Association
- American Gas Association
- American Gastroenterological Association
- American Go Association
- American Grandprix Association
- Amiga Advanced Graphics Architecture
- Androgenetic alopecia
- Anti-gliadin antibodies
- Anu Aga
- Architectural Glass and Aluminum
- Art Gallery of Alberta
- Aspartylglucosaminidase
- Assemblies of God in Australia
- Association of Government Accountants
- Australian Go Association
- Avgusta
- Ağa
- Brestovăț
- Maria-Laura Aga
- Monte Aga
- Patrick Aga
- Ragheb Aga
- Selim Aga
- Ága (film)