PA
- pa – (s) Punjabi language (ISO 639-1 code)
- pA – (s) picoampere
- Pa
- (s) pascal
- Protactinium
- PA
- (a/i) Pamela Anderson
- (s) Panama (ISO 3166 digram)
- Paraguay (FIPS 10-4 country code)
- (i) Partial Agonist
- (s) Pennsylvania (postal symbol)
- petampere
- (i) PolyAmide (Nylon)
- Prince Albert piercing
- Public Address (vocal amplification system)
- Public Affairs
- PA 6 – (s) Nylon 6 (PolyAmide) (similarly for PA 11, 12, 46, 66, 610)
- PAA – (i) Position Area for Artillery
- PAB – (s) Panamanian balboa (ISO 4217 currency code)
- PABX – (p) Private Automated Branch eXchange (company phone system)
- PAC
- (i) Pan Africanist Congress
- (a) Partial Solar Calibrator
- Patriot Advanced Capabilities
- Political action committee
- (a/i) Primary Auditory Cortex
- PACOM – (p) (U.S.) Pacific Command
- PADI – (a) Professional Association of Diving Instructors
- PAEK – (i) PolyArylEtherKetone
- PAFC – (i) Plymouth Argyle Football Club
- PAH – (i) Polycyclic aromatic hydrocarbon
- PAHO – (i) Pan American Health Organization
- PAI
- (i) PolyAmide Imide
- Pre-Approval Inspection (pharma)
- PAK – (s) Pakistan (ISO 3166 trigram)
- Pakistan – (p) Punjab, Afghan states, Kashmir, sIndh, baluchiSTAN
- PAL
- (a) Phase Alternating Line (TV standard)
- (p) Philippine Airlines
- PAM – (a/i) Precision Attack Missile
- Pamida – (p) Patrick, Michael, and David, sons of the department store chain's co-founder Jim Witherspoon
- PAMELA
- (a) Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics
- (a) Pedestrian Accessibility and Movement Environment Laboratory
- pan – (s) Punjabi language (ISO 639-2 code)
- PAN
- (s) Panama (ISO 3166 trigram)
- (a) Personal Area Network
- (i) PolyAcryloNitrile
- PANS – (a) Pretty Advanced/Awesome Network Services (cf. POTS)
- Pan-STARRS – (p) Panoramic Survey Telescope And Rapid Response System
- PAO – (i) Public Affairs Officer
- PAPI – (a) Precision Approach Path Indicator (aviation)
- PAR – (s) Paraguay (IOC and FIFA trigram, but not ISO 3166)
- PARC – (a) Palo Alto Research Center
- PAROS – (a) Prevention of an Arms Race in Outer Space (treaty)
- PARP – (i) (NATO Partnership for Peace) Planning And Review Process
- PARWIG – (a) Power Augmented Ram Wing In Ground (aeroplane wing shape)
- PAS – See entry
- PASA – (i) PolyAmide, Semi-Aromatic (Nylon)
- PASGT – (i) Personnel Armor System, Ground Troops
- PASR – (i) Personnel Accounting and Strength Reporting
- PATH – (a) Port Authority Trans-Hudson
- PAWS
- (a) Phased Array Warning System
- Progressive Animal Welfare Society
- PAYD – (a) Pay As You Drive
- PAYE – (a) Pay As You Earn
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