| aromàtico | aromatic |
| Arona | Arona |
| Aronne | Aaron |
| AROS | AROS Research Operating System |
| Arosa | Arosa |
| Aroue-Ithorots-Olhaïby | Aroue-Ithorots-Olhaïby |
| Around the Sun | Around the Sun |
| Aroz | Aroz |
| ARP poisoning | ARP spoofing |
| arpa | harp |
| Arpa celtica | Clàrsach |
| Arpacsad | Arpachshad |
| Arpad | Arpad |
| Arpad Emrick Elo | Arpad Elo |
| Arpadi | Árpád dynasty |
| arpagone | scrooge |
| Arpajon | Arpajon |
| Arpalice | Harpalyke |
| ARPANET | ARPANET |
