| arbitrio | volition |
| arbitro | judge |
| Arbogaste | Arbogast |
| Arbois | Arbois |
| Arboldswil | Arboldswil |
| Arbon | Arbon |
| Arbonne | Arbonne |
| Arbonne-la-Forêt | Arbonne-la-Forêt |
| arboreto | arboretum |
| arboricolo | arboreal |
| arboricoltura | arboriculture |
| arboscello | sapling |
| Arbouet-Sussaute | Arbouet-Sussaute |
| Arbovirus | Arbovirus |
| Arbre | Tree |
| Arbrissel | Arbrissel |
| arbusti | bushes |
| arbusto | bush |
| Arbutus | Arbutus |
| Arbutus unedo | Arbutus |
| Arbérats-Sillègue | Arbérats-Sillègue |
| Arbëreshë | Arbëreshë |
| arca | ark |
| Arca dell'Alleanza | Ark of the Covenant |
| Arca russa | Russian Ark |
| Arcachon | Arcachon |
| Arcade Fire | Arcade Fire |
| Arcadia | Arcadia |
| Arcadio di Bisanzio | Arcadius |
| Arcadio María Larraona Saralegui | Arcadio Larraona Saralegui |
| arcaico | ancient |
| arcaismo | archaism |
