APS
- 3'-Phosphoadenosine-5'-phosphosulfate
- AP (disambiguation)
- APS underwater rifle
- Abbottabad Public School
- Aborigines' Protection Society
- Active protection system
- Active-pixel sensor
- Adarsh Public School
- Adult Protective Services
- Advanced Photo System
- Advanced Photon Source
- Advanced planning and scheduling
- Africa Partnership Station
- Alamogordo Public Schools
- Alba-la-Romaine
- Albuquerque Public Schools
- Algebra of physical space
- Algeria Press Service
- Allendale Public Schools
- Alstom APS
- Alternative Press Syndicate
- American Pediatric Society
- American Philatelic Society
- American Philosophical Society
- American Physical Society
- American Physiological Society
- American Phytopathological Society
- Ammonium persulfate
- Annual Population Survey
- Anpartsselskab
- Antiphospholipid syndrome
- Application Packaging Standard
- Apse (disambiguation)
- Apsley railway station
- Apus
- Arizona Public Service
- Arlington Public Schools
- Armenian Professional Society
- Associated Public Schools of Victoria
- Association for Psychological Science
- Association for Psychosocial Studies
- Asynchronous Protocol Specification
- Atlanta Public Schools
- Aurora Public Schools (Colorado)
- Australasian Proteomics Society
- Australian Protective Service
- Australian Psychological Society
- Australian Public Service
- Autoimmune polyendocrine syndrome
- Average propensity to save
- East Aurora Public School District 131
- Indian Army Public Schools
- List of United States Navy amphibious warfare ships
- Pedestrian Signal
- S-IVB
- SES Platform Services
- Stechkin automatic pistol
- Thermal spraying
- West Aurora Public School District 129
- Zigbee