Aru
- Alpha Rho Upsilon
- American Railway Union
- Anglia Ruskin University
- Aquarium Rescue Unit
- Araçatuba Airport
- Ardhi University
- Army Rugby Union
- Aru Islands Regency
- Aru Kingdom
- Aru Krishansh Verma
- Aru Tateno
- Aru language (disambiguation)
- Aru, Basht
- Aru, Damavand
- Aru, Democratic Republic of Congo
- Aru, Firuzkuh
- Aru, Harju County
- Aru, Jammu and Kashmir
- Aru, Kohgiluyeh and Boyer-Ahmad
- Aru, Saare County
- Aruba
- Arundel railway station
- Automated response unit
- Autonomous Recording Unit
- Fabio Aru
- Ines Aru
- Krista Aru
- Peep Aru
- Rugby Australia