Arp or ARP may refer to:
Businesses and organizations Applied Research in Patacriticism, a digital humanities lab based at the University of Virginia, US Amphibious Reconnaissance and Patrol Unit, a Taiwan special forces group Air Raid Precautions, a UK civil defence 1924–1946 Anti-Revolutionary Party (Dutch Anti-Revolutionaire Partij), a defunct Dutch political party Autoradiopuhelin (car radio phone), a Finnish mobile phone network Assembly of the Representatives of the People, Tunisian government Associate Reformed Presbyterian Church (ARPC), US Association for Research in Personality, US
Law Adaptation Reporting Power, under the UK 2008 Climate Change Act American Rescue Plan Act of 2021, an economic stimulus bill
Music ARP Instruments, a former electronic musical instrument maker Arpeggiator, on sound synthesizers and electronic organs "Arp", a song by Apoptygma Berzerk from The Apopcalyptic Manifesto "Arp", a song by Arcane Roots from Melancholia Hymns "Faust Arp", a song by Radiohead from their album In Rainbows "Arp #1", a song by French artist Jackson and His Computerband from his album Glow.
Places Arp, Georgia, US Arp, Tennessee, US Arp, Texas, US
Science and technology Active rollover protection, a vehicle safety technology Address Resolution Protocol, a communication protocol Arc routing problem, a category of general routing problems Arp catalogue, of galaxies Arp, a rosemary cultivar
People Andrice Arp (born 1969), US comics artist and illustrator Bill Arp, (1826-1903) Charles Henry Smith, US writer and politician. Halton Arp (1927–2013), American astronomer Fiete Arp (born 2000), German footballer Jean Arp (1886–1966) or Hans Arp, German-French artist Robert Arp (born 1970), American philosopher Sophie Taeuber-Arp (1889–1943), Swiss artist Arp Schnitger (1648-1719), German organ builder
Other uses Airport reference point, a designated geographical location Aerial Rescue Platform, a type of stretcher used in helicopter rescue missions Arapaho language (ISO 639-3 code: arp), a Native American language
See also AARP, formerly the American Association of Retired Persons Actin-related protein, for example Arp10) Arp2/3 complex, a protein ARP spoofing, a networking attack AR-15–style pistol, a handgun with an AR-15-style receiver