Aru or ARU may refer to:
Education Alpha Rho Upsilon, a defunct fraternity in the United States Anglia Ruskin University, a university in England Ardhi University, a Tanzanian public university
Places Aru Islands Regency, a group of islands and the regency in the Moluccas Aru, Democratic Republic of Congo, a town in Ituri province Aru, Harju County, village in Kuusalu Parish, Harju County, Estonia Aru, Saare County, village in Saaremaa Parish, Saare County, Estonia Aru, Kohgiluyeh and Boyer-Ahmad, village in Gachsaran County, Kohgiluyeh and Boyer-Ahmad Province, Iran Aru, Basht, village in Basht County, Kohgiluyeh and Boyer-Ahmad Province, Iran Aru, Damavand, village in Damavand County, Tehran Province, Iran Aru, Firuzkuh, village in Firuzkuh County, Tehran Province, Iran Aru, Jammu and Kashmir, village in India Aruba, IOC and UNDP country code ARU
Sports Fabio Aru, Italian cyclist Army Rugby Union, organizational body for rugby union in the British Army Australian Rugby Union, former name of Rugby Australia, governing body for rugby union in Australia
Technology Automated response unit, a telecommunications device Autonomous Recording Unit, an audio recording device
People Ines Aru (born 1939), Estonian actress Krista Aru (1958–2025), Estonian historian, museologist and politician Peep Aru (born 1953), Estonian politician Aru Tateno (born 1997), Japanese ice dancer Aru Krishansh Verma (born 1986), Indian actor
Other uses American Railway Union, an industrial union in the United States Aquarium Rescue Unit, an American jazz-rock band Araçatuba Airport, IATA airport code Arundel railway station, a railway station in England (National Rail code ARU) Aru language (disambiguation) Aru Kingdom, an early Islamic polity in northeast Sumatra between the 13th and 16th centuries