{{wiktionary|ARPA|arpa}} '''Arpa''' or '''ARPA''' may refer to:
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==Given name== * Arpa Ke'un (died 1336), Ilkhan during the disintegration of the Mongol state in Persia
==Surname== * José Arpa (1858–1952), Spanish artist who worked in Spain, Mexico, and Texas * Okay Arpa (born 1977), Turkish karateka * Yvan Arpa, Swiss watch designer
==Geographical names== * Areni, formerly Arpa, a village in Armenia * Arpi, Armenia, also known as Arpa, a town in Armenia * Arpa (river), in Armenia * Arpa (river), Chhattisgarh in Chhattisgarh, India * Akhurian River, ''Arpa'' in Turkish, river in Turkey and Armenia * Arpa Darreh, a village in Iran * Arpa Valley, a high-altitude valley in Kyrgyzstan
== Music == * Arpa d'Eolo, a musical instrument * Arpa jarocha, a Mexican harp used in conjunto jarocho music * Rinaldo dall'Arpa (died 1603), Italian composer, singer, and harpist
== Acronym== * Advanced Research Projects Agency, former name of the US Defense Advanced Research Projects Agency * ARPA-E, the Advanced Research Projects Agency-Energy, an agency created in 2007 within the US Department of Energy * ARPA-H, the Advanced Research Projects Agency for Health, an organization created in 2022 within the US National Institutes of Health * ARPA-I, the Advanced Research Projects Agency for Infrastructure, an organization created in 2022 within the US Department of Transportation * HSARPA, the Homeland Security Advanced Research Projects Agency, an agency within the Science and Technology Directorate at the US Department of Homeland Security * IARPA, the Intelligence Advanced Research Projects Activity, an organization within the US Office of the Director of National Intelligence * .arpa (address and routing parameter area), a top-level domain in the Domain Name System of the Internet * Aerolíneas Paraguayas, a former Paraguayan airline * Agenzie Regionali per la Protezione Ambientale, the Italian Regional Environmental Protection Agency * Amazon Region Protected Areas Program, an initiative to expand protection of the Amazon rainforest in Brazil * American Rescue Plan Act of 2021, an economic stimulus program of the United States * Archaeological Resources Protection Act of 1979, a federal law of the United States * Arctic Research and Policy Act of 1984 (amended 1990) * Automatic radar plotting aid, a capability of some marine radar systems * Average revenue per account, a metric similar to average revenue per user
==Other uses== * Arpa Yeghegnadzor, an inactive Armenian football club * ''Arpa şehriye'', Turkish for orzo
== See also == * Biomedical Advanced Research and Development Authority (BARDA) * Arpa Chai (disambiguation) {{srt}}
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