| arum | aro |
| Arum italicum | Arum italicum |
| Arum titan | Amorphophallus titanum |
| Arunachal Pradesh | Arunachal Pradesh |
| Aruncus | Aruncus |
| Arundinaria | Arundinaria |
| Arundo | Arundo |
| Arusha | Arusha |
| Arutua | Arutua |
| Arvernes | Arverno |
| Arvicola sapidus | Arvicola sapidus |
| Arvieu | Arvieux |
| Arvieux | Arvieux |
| Arvigna | Arvigna |
| Arvigo | Arvigo |
| ARVN | Fuerzas Armadas de la República de Vietnam |
| Arvo Pärt | Arvo Pärt |
| Arwen Étoile du Soir | Arwen |
| ArXiv | ArXiv |
| Arya | Arya |
| Aryabhata | Aryabhata |
| Aryballe | Aríbalo |
| aryen | ario |
| aryenne | aria |
| Aryens | Raza aria |
| Aryle | Grupo arilo |
| ARYM | República de Macedonia |
| Arzal | Arzal |
| Arzawa | Arzawa |
| Arzier | Arzier |
| Arzier-Le Muids | Arzier |
| Arzon | Arzon |
| Arzviller | Arzviller |
| Arzúa | Comarca de Arzúa |
| Arçais | Arçay |
| Arçay | Arçay |
| arèglement | ajuste |
| arène | arena |
| arène de taureaux | plaza de toros |
| Arènes de Mexico | Plaza de Toros México |
| Arènes de Nîmes | Arena de Nimes |
| Arènes de Santamaría | Plaza de toros de Santamaría |
| Arènes de Vérone | Arena de Verona |
| Arènes du Campo Pequeno | Campo Pequenho |
| Arès | Ares |
| arénicole | lombriz de cebo |
| Aréographie | Geografía de Marte |
| Aréologie | Escala de tiempo geológica de Marte |
| Aréthuse | Aretusa |
| Arétée | Areteo de Capadocia |
| arête | espina |
| arôme | aroma |
| as | as |
| AS Bari | Associazione Sportiva Bari |
| AS Casale Calcio | Associazione Sportiva Casale Calcio |
| as dans la manche | as en la manga |
| as de carreau | as de diamantes |
| as de cœur | as de corazones |
| as de trèfle | as de tréboles |
| AS Livourne Calcio | Associazione Sportiva Livorno Calcio |
