Arg or ARG may refer to:
Places Arg () means "citadel" in Persian, and may refer to: Arg, Iran, a village in Fars Province, Iran Arg, Kabul, presidential palace in Kabul, Afghanistan Arg, South Khorasan, a village in South Khorasan Province, Iran Arg of Karim Khan Arg of Tabriz Arg-é Bam, an ancient citadel in Bam, Iran Arg-e Rayen, Kerman, Iran Herat Citadel, also known as Arg-e Herat ARG, the ISO 3166-1 alpha-3 and UNDP country code for Argentina
People James Argent, nicknamed "Arg"
Arts, entertainment, and media Alternate reality game American Record Guide, a classical music magazine Archive for Reformation History, journal Arg!, a mod for the 1998 video game Half-Life
Mathematics Argument (complex analysis), the angular component of a complex number or function Argument of a function, a specific input in a mathematical function
Military A US Navy hull classification symbol: Internal combustion engine repair ship (ARG) Amphibious ready group of US Navy
Organizations and enterprises Aerolíneas Argentinas (ICAO: ARG) American Research Group, US polling research firm Architectural Resources Group, a firm based in San Francisco, US Architectural Research Group, Philadelphia, US, 1932–35 Austin Rover Group, 1980s UK carmaker
Transportation ARG Argentina Línea Privada, 2001–02, at other times airline LAPA (Líneas Aéreas Privadas Argentinas) Arisaig railway station, UK, National Rail code Australian Railroad Group, a former rail freight operator
Other uses Antigua Recreation Ground, the national stadium of Antigua and Barbuda Former Argentine gold and silver pesos, ISO 4217 code Arginine, an α-amino acid abbreviated as Arg or R Aragonese language, ISO 639 alpha-3 code arg
See also Argh (disambiguation)