| Acrux | Alfa de la Cruz |
| Act of Settlement | Acta de Establecimiento |
| Acta Diurna | Acta Diurna |
| Acta martyrum | Actas de los Mártires |
| Action directe | Acción Directa |
| Action Internationale Contre la Faim | Acción Contra el Hambre |
| Action painting | Action painting |
| Action research | Investigación-acción |
| Action RPG | ARPG |
| ActionScript | ActionScript |
| Active Directory | Active Directory |
| Active Server Pages | Active Server Pages |
| Actors Studio | The Actors Studio |
| Acura | Acura |
| Acy | Acy |
| Acyklowir | Aciclovir |
| Aczinowie | Aceh |
| AD | AD |
| ad hoc | ad hoc |
| Ad-Aware | Ad-Aware |
| Ad-Dachila | Villa Cisneros |
| Ad-Dachla | Villa Cisneros |
| Ad-Dauha | Doha |
| Ada | Lenguaje de programación Ada |
| Ada Falcon | Ada Falcón |
| Ada Lovelace | Ada Lovelace |
| Adab | Adab |
| Adachi | Adachi |
| Adad | Ishkur |
| Adadnirari I | Adad-nirari I |
| Adaks | Addax nasomaculatus |
| Adalbert | Adalberto |
| Adalgunda | Adelgunde |
| Adam | Adán |
| Adam Albert Neipperg | Adam Adalbert von Neipperg |
| Adam Clayton | Adam Clayton |
| Adam Czerniaków | Adam Czerniaków |
| Adam Darski | Adam Darski |
| Adam de la Halle | Adam de la Halle |
| Adam Gottlob Oehlenschläger | Adam Oehlenschläger |
| Adam i Ewa | Adán y Eva |
| Adam Jerzy Czartoryski | Adam Jerzy Czartoryski |
| Adam Kazimierz Czartoryski | Adam Kazimierz Czartoryski |
| Adam Levine | Adam Levine |
| Adam Małysz | Adam Małysz |
| Adam Mickiewicz | Adam Mickiewicz |
| Adam Opel | Adam Opel |
| Adam Opel AG | Opel |
| Adam Sandler | Adam Sandler |
| Adam Savage | Adam Savage |
| Adam Smith | Adam Smith |
| Adam Weishaupt | Adam Weishaupt |
| Adam z Bremy | Adán de Bremen |
| Adam Zagajewski | Adam Zagajewski |
| Adamawa | Adamawa |
| Adams | Adams |
| Adamstown | Adamstown |
| Adamswiller | Adamswiller |
| Adana | Adana |
| Adapa | Alulim |
| adaptacja | adaptación |
| Adapter | Adapter |
| adaptować | adaptar |
| Adar | Adar |
| Adara | Adhara |
| ADAT | ADAT |
| Adazaur | Adasaurus |
| Add-on | Plugin |
| Adda | Río Adda |
| Addis Abeba | Adís Abeba |
| Addukt | Aducto |
| Adeccoligaen | Adeccoligaen |
| adekwatny | apropiado |
| Adela | Adela |
| Adela Pennyfather | Aslan |
| Adela z Szampanii | Adela de Champaña |
| Adelaide | Adelaida |
| Adelaide Football Club | Adelaide Crows |
| Adelajda | Adelaida |
| Adelajda Burgundzka | Adelaida |
| Adelajda Sachsen-Meiningen | Adelaida de Sajonia-Meiningen |
| Adelard z Bath | Adelardo de Bath |
| Adelina Patti | Adelina Patti |
| Ademar z Monteil | Ademar de Monteil |
| Ademir Marques de Menezes | Ademir Marques de Menezes |
| Aden | Adén |
| Aden Abdullah Osman Daar | Aden Abdullah Osman Daar |
| adenina | adenina |
| Adenowirusy | Adenovirus |
| Adenozynodifosforan | Adenosín difosfato |
| Adenozynomonofosforan | Adenosín monofosfato |
| Adenozynotrifosforan | Adenosín trifosfato |
| Adeodat I | Adeodato I |
| Adeodat II | Adeodato II |
| adept | adepto |
| Adeste Fideles | Adeste Fideles |
| Adewale Akinnuoye-Agbaje | Adewale Akinnuoye-Agbaje |
| Adhemar Ferreira da Silva | Adhemar Ferreira da Silva |
| Adhokracja | Adhocracia |
| Adi Shamir | Adi Shamir |
| Adi Śankara | Adi Shankara |
| Adiantum | Adiantum |
| adidas | tenis |
| Adilly | Adilly |
| Adinkra | Símbolos Adinkra |
| Adissan | Adissan |
| Aditi | Aditi |
| Adium | Adium |
| Adlai Ewing Stevenson | Adlai Stevenson |
| Adlai Ewing Stevenson II | Adlai Stevenson |
| Adlai Stevenson | Adlai Stevenson |
| Adler | Adler |
| Admet | Admeto |
| Admete | Admete |
| administracja | administración |
| administracja publiczna | institución pública de la naturaleza administrativa |
