| Acronym | Definition |
|---|
| ARPA➣Advanced Research Projects Agency (US DoD; now DARPA) |
| ARPA➣Advanced Research Projects Agency |
| ARPA➣Address and Routing Parameter Area |
| ARPA➣Automatic Radar Plotting Aid |
| ARPA➣Agenzia Regionale Protezione Ambiente (Italian: Regional Agency for the Protection of Environment) |
| ARPA➣Amazon Region Protected Areas |
| ARPA➣Archaeological Resources Protection Act of 1979 |
| ARPA➣Australian Review of Public Affairs (publication; University of Sydney; Sydney, Australia) |
| ARPA➣Agricultural Risk Protection Act of 2000 |
| ARPA➣American Review of Public Administration |
| ARPA➣Alberta Recreation and Parks Association |
| ARPA➣Australian Retired Persons Association |
| ARPA➣Association Rissoise de Protection des Animaux |
| ARPA➣Alabama Recreation and Parks Association |
| ARPA➣Australasian Religious Press Association |
| ARPA➣Arizona Rail Passenger Association |
| ARPA➣Australian Rehabilitation Providers Association |
| ARPA➣Arkansas Psychological Association |
| ARPA➣Atlantic Region Philosophers Association (Canada) |
| ARPA➣Arkansas Rifle & Pistol Association |
| ARPA➣Astoria Railroad Preservation Association (Astoria, OR) |
| ARPA➣Advanced Radar Plotting Aid |
| ARPA➣Alaska Recreation and Park Association |
| ARPA➣Austrian Research Promotion Agency |
| ARPA➣Arctic Research and Policy Act of 1984 |
| ARPA➣African Revenue Protection Association |
| ARPA➣Arkansas Recreation and Parks Association |
| ARPA➣Amicale Rétro Peugeot Atlantique (French car club; Nantes, France) |
| ARPA➣Airbreathing and Rocket Propulsion Analysis (tool for space vehicle design) |
| ARPA➣Autolinee Regionali Pubbliche Abruzzesi SpA |
| ARPA➣Arizona Rock Product Association |
| ARPA➣American Red Poll Association |
| ARPA➣Aachener Rechner-Pools Audimax |
| ARPA➣Area Radar Prediction Analysis |
| ARPA➣Army Research Projects Agency |
| ARPA➣Average Revenue Per Account |
| ARPA➣Association Rwandaise des Personnes Agees (French) |
| ARPA➣Association for Reformed Political Action |
| ARPA➣Asociación de Periodistas de Televisión y Radio de la Argentina (Spanish: Argentina Television and Radio Journalists Association; Argentina) |
| ARPA➣Association of Rights Protected Artists |
| ARPA➣Approval of Regulatory Program Amendments |
| ARPA➣Analysis, Research & Planning for Armenia (Granada Hills, CA) |
| ARPA➣Austalian Prudential Regulation Authority |