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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