| old | alt |
| Old Acquaintance | In Freundschaft verbunden |
| old age | Alter |
| old age exemption | Altersfreibetrag |
| old age insurance | Pensionsversicherung |
| old age pensioner | Rentner |
| old age poverty | Altersarmut |
| Old Akkadian | altakkadisch |
| Old and New | Die Generallinie |
| old apartment | Altbauwohnung |
| old as the hills | steinalt |
| Old Azari language | Altaserbaidschanische Sprache |
| old bachelor | Hagestolz |
| old bag | Besen |
| Old Bailey | Old Bailey |
| old banger | alte Kutsche |
| Old Bavaria | Altbayern |
| old beater | alte Kutsche |
| old before one's time | schwächer, als das Lebensalter vermuten ließe |
| Old Believers | Altorthodoxe |
| old beyond one's years | reifer, als in dem Alter üblich |
| old biddy | Oma |
| Old Bill | Bullerei |
| old book | altes Buch |
| old boot | alte Eule |
| Old Boy | Oldboy |
| old boy network | Seilschaft |
| old boy next door | Alte von nebenan |
| Old boy! | Alter Junge! |
| old boy's network | Seilschaft |
| Old Boyfriends | Diane |
| Old Bridge | Old Bridge |
| old building | Altbau |
| old buildings | Altbauten |
| old bull | Platzhirsch |
| old Byzantine | altbyzantinisch |
| old campaigner | alte Kämpe |
| old car | Altauto |
| Old Castle | Altes Schloss |
| Old Cathedral | der Alte Dom |
| Old Catholic | altkatholisch |
| Old Catholic Church | Altkatholische Kirche |
| Old Catholic Church of the Netherlands | Altkatholische Kirche der Niederlande |
| Old Catholic Mission in France | Altkatholische Kirche |
| Old chap | Kamerad |
| old chestnut | alter Hut |
| Old Chinese | Altchinesische Sprache |
| Old Church Slavic | Altkirchenslawisch |
| Old Church Slavonic | Altkirchenslawisch |
| old citizens | Alten |
| Old City | Altstadt |
| Old City of Jerusalem | Altstadt |
| old clothes | alte Klamotten |
| old clothes collection | Kleidersammlung |
