AP
- AP – (i) Advanced Placement – Air Publication – (s) Armed Forces Pacific (postal symbol) – (i) Associated Press – Auto Pilot - abject poverty – (s) Andhra Pradesh (Indian state code)
- APA –(i) American Psychiatric Association
- APB – (i) All Points Bulletin (police jargon)
- APC – (i) Armoured Personnel Carrier – Armour Piercing Capped (ammunition)
- APEC – (a) Asia Pacific Economic Cooperation
- APCNR – (i) Armour-Piercing, Composite Non-Rigid (ammunition)
- APCR – (i) Armour-Piercing, Composite Rigid (ammunition)
- APDS – (i) Armour-Piercing, Discarding-Sabot (ammunition)
- APEDS – (a) AMSAA Performance Estimates Data System
- APEX – (p) Applied Physics Express
- APFSDS – (i) Armour-Piercing, Fin-Stabilised, Discarding Sabot (ammunition)
- APHA – (i) American Public Health Association
- APHE – (i) Armour-Piercing, High Explosive (ammunition)
- APHIS – (a) Animal and Plant Health Inspection Service
- API – (i) Application Programming Interface
- APL – (i) A Programming Language – Acute Promyeloid Leukaemia – Anti-Personnel Landmine – Applied Physics Laboratory (Johns Hopkins University)
- APM – (i) Advanced Power Management
- APOD – (i) Aerial Port (Airport) Of Debarkation
- APOE – (i) Aerial Port (Airport) Of Embarkation
- APOLLO – (a) Apache Point Observatory Lunar Laser-ranging Operation
- APP – (i) Allied Procedural Publication
- APR – (i) Annual Percentage Rate
- APS – (i) American Physical Society – Antiphospholipid Antibody Syndrome
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