ARO (short for Auto Romania) was a Romanian off-road vehicle manufacturer located in Câmpulung-Muscel. The first ARO vehicles were produced in 1957, and the last in 2003. For a short while, Daihatsu-powered AROs were sold in Spain and produced in Portugal under the brands Hisparo and Portaro, respectively. In Italy, Volkswagen-powered AROs were produced by ARO-Ciemme and sold under the ACM brand.

Aro may refer to:

• Aro people, an Igbo subgroup in West Africa
• Aro Confederacy, a precolonial Igbo trading oligarchy in West Africa
• Årø (Denmark), a small island in the Lillebælt in Denmark
• Årø, Norway, a neighborhood of Molde
• Aro, Papua New Guinea, a village in Morobe Province
• Aro gTér, a lineage within Tibetan Buddhism
• Aro, a deity in Igbo mythology
• Aro (Twilight), a character in the Twilight saga by Stephenie Meyer
• Aro (instrument), a folk instrument used in traditional Yoruba music
• Aro Manufacturing Co. v. Convertible Top Replacement Co., a US patent law decision concerning repair, replacement, and the aftermarket
• Aro (murderer) (died 1957), the last person executed in Papua New Guinea
• Aro River, a tributary of the Orinoco River in Venezuela.
• Aro (surname)

ARO may refer to:

• ARO (Auto Romania), a car company
• Asset retirement obligation, a financial liability which provides for future disposal of assets
• Arctic Research Office, a division of the US NOAA
• Arizona Radio Observatory, a part of Steward Observatory at the University of Arizona
• Army Research Office, a department of the United States Army Research Laboratory
• Agricultural Research Organization, of the Israeli Ministry of Agriculture
• ARO, the stock ticker symbol for Aéropostale (clothing)
• ARO, after receipt of order
• Algonquin Radio Observatory, a radio telescope research facility in Ontario, Canada
• Airport Reservation (or Reporting) Office

Årø may refer to:

• Årø (Denmark), an island off Jutland, Denmark
• Årø, Norway, a neighborhood of Molde, on the north coast of Norway
• Molde Airport, Årø