| ad infinitum | ad infinitum |
| Ad interim | Interval |
| ad libitum | ad lib |
| Ad Majorem Dei Gloriam | Ad maiorem Dei gloriam |
| ad nauseam | ad nauseam |
| ad rem | witty |
| AD São Caetano | Associação Desportiva São Caetano |
| Ad van den Berg | Adrian Vandenberg |
| Ad-aware | Ad-Aware |
| Ada | Ada |
| Ada Air | Ada Air |
| Ada Lovelace | Ada Lovelace |
| Ada Negri | Ada Negri |
| Adab | Adab |
| ADAC | ADAC |
| Adad | Adad |
| Adad-nirari I | Adad-nirari I |
| Adad-nirari II | Adad-nirari II |
| Adad-Nirari III | Adad-nirari III |
| adagio | adagio |
| Adagio for Strings | Adagio for Strings |
| adagium | proverb |
| Adair County | Adair County |
| Adaja | Adaja |
| Adalbert van Praag | Adalbert of Prague |
| Adam | Adam |
| Adam Clayton | Adam Clayton |
| Adam Copeland | Adam Copeland |
| Adam de la Halle | Adam de la Halle |
| Adam Elsheimer | Adam Elsheimer |
| Adam en Eva | Adam |
| Adam Jerzy Czartoryski | Adam Jerzy Czartoryski |
| Adam Johann von Krusenstern | Adam Johann von Krusenstern |
| Adam Levine | Adam Levine |
| Adam Małysz | Adam Małysz |
| Adam Michna z Otradovic | Michna |
| Adam Mickiewicz | Adam Mickiewicz |
| Adam Nelson | Adam Nelson |
| Adam Oehlenschläger | Adam Gottlob Oehlenschläger |
| Adam Opel | Adam Opel |
| Adam Sandler | Adam Sandler |
| Adam Savage | Adam Savage |
| Adam Smith | Adam Smith |
| Adam van Bremen | Adam of Bremen |
| Adam Weishaupt | Adam Weishaupt |
| Adamantios Koraïs | Adamantios Korais |
| Adamantisaurus | Adamantisaurus |
| Adamawa | Adamawa State |
| Adamclisi | Adamclisi |
| Adamello | Adamello-Presanella |
| Adamiet | Adamite |
| Adamov | Adamov |
| Adams | Adams |
| Adams-Onísverdrag | Adams-Onís Treaty |
| adamsappel | Adam's apple |
| adamskostuum | birthday suit |
| adamsnaald | yucca |
| Adamswiller | Adamswiller |
| Adamówka | Gmina Adamówka |
| Adana | Adana |
| Adana Demirspor | Adana Demirspor |
| Adanaspor | Adanaspor |
| Adapa | Adapa |
| Adapazarı | Adapazarı |
| adapteerbaar | adaptable |
| adapter | adapter |
| adapteren | adapt |
| adaptief | adaptive |
| Adaptive Software Development | Adaptive Software Development |
| Adar | Adar |
| Adasaurus | Adasaurus |
| Adatara | Mount Adatara |
| ADCP | Acoustic Doppler Current Profiler |
| Adda | Adda River |
| Addams Family Reunion | Addams Family Reunion |
| Addams Family Values | Addams Family Values |
| addendum | addendum |
