- AACT
- a-adic completion
- a-adic topology
- A&AEE
- A. A. Fraenkel
- A. A. Fraenkel (1891—1965)
- A.A.Galich
- AAI
- AAIDD
- AAIM
- Aaiun El
- AAJA
- AALA
- AALAS
- AALCO
- Aalen
- Aalenian Stage
- Aalen's additive regression model
- Aale Tynni
- A-algebra
- A-algorithm
- Aalsmeer
- Aalto University School of Arts, Design and Architecture
- Aaly Tokombaev
- AAM