AAP
- 2AP (disambiguation)
- A-A-P
- AAPS (disambiguation)
- AP (disambiguation)
- APA (disambiguation)
- APP (disambiguation)
- Aam Aadmi Party
- Aappilattoq Heliport (Avannaata)
- Accredited ACH Professional
- Advance Auto Parts
- Advanced Active Partition
- Aerobic anoxygenic phototroph
- Agrupación Aérea Presidencial
- Airport Armed Police
- Aji Pangeran Tumenggung Pranoto International Airport
- Alanine aminopeptidase
- Alexandra Palace railway station
- American Academy of Pediatrics
- American Academy of Periodontology
- Andrau Airpark
- Ann Arbor Pioneer High School
- Ap (water)
- Apollo Applications Program
- Argumentum ad populum
- ArtAsiaPacific
- Associated Artists Productions
- Association of American Physicians
- Association of American Publishers
- Association of Australasian Palaeontologists
- Atypical antipsychotic
- Australasian Association of Philosophy
- Australian Associated Press
- Cornell University College of Architecture, Art, and Planning
- List of FIA member organisations
- PAA (disambiguation)
- Pará Arára language
- RAF Lympne