Arpa and ARPA may refer to:
- Arpa
- Arpa River in Armenia
- Areni, Armenia - formerly called Arpa
- Arpi, Armenia, also called Arpa
- Turkish for Akhurian River in Turkey and Armenia
- Italian for harp, sometimes used in scores
- ARPA
- Advanced Research Projects Agency, renamed the Defense Advanced Research Projects Agency (DARPA) in 1972
- .arpa, top-level domain name, the acronym for the Address And Routing Parameter Area of Internet infrastructure
- Automatic Radar Plotting Aid
- Average Revenue Per Advertiser
- Archaeological Resources Protection Act
- ARPA - Aerolineas Paraguayas
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