| ATC | ATC |
| ATC code A | ATC |
| ATC code B | ATC |
| ATC code C | ATC |
| ATC code D | ATC |
| ATC code G | ATC |
| ATC code H | ATC |
| ATC code J | ATC |
| ATC code L | ATC |
| ATC code M | ATC |
| ATC code N | ATC |
| ATC code P | ATC |
| ATC code R | ATC |
| ATC code S | ATC |
| ATC code V | ATC |
| Atchison County | Hrabstwo Atchison |
| Ateas | Ateas |
| Atef Sedki | Atef Sedki |
| Atefah Sahaaleh | Ateqeh Rajabi |
| Atelidae | Czepiakowate |
| Atelinae | Czepiaki |
| Atemi | Atemi |
| Aten | Aton |
| Aten asteroid | Grupa Atona |
| Atenas De San Carlos | Atenas San Carlos |
| Atenolol | Atenolol |
| Aterno | Pescara |
| ATEX directive | ATEX |
| Athabasca River | Athabaska |
| Athabaskan languages | Języki atapaskańskie |
| Athalaric | Atalaryk |
| Athamas | Atamas |
| Athanagild | Roderyk |
| Athanasius Kircher | Athanasius Kircher |
| Athapasca | Atabaskowie |
| Atharvaveda | Atharwaweda |
| atheism | ateizm |
| atheist | ateista |
| atheistic | ateistyczny |
| Athelas | Athelas |
| Athelstan of England | Athelstan |
| Athena | Atena |
| Athenagoras | Atenagoras I |
| Athenagoras of Athens | Atenagoras z Aten |
| Athene | Ateny |
| Athene noctua | Pójdźka |
| Athenian democracy | Demokracja ateńska |
| Athenodoros Cananites | Atenodoros Kananites |
| Athens | Ateny |
| Athens Charter | Karta Ateńska |
| Athens International Airport | Port lotniczy Ateny |
| Athens Metro | Metro ateńskie |
| Athens Olympic Sports Complex | Stadion Olimpijski w Atenach |
| Athens Prefecture | Ateny |
| AtheOS File System | AtheOS FS |
| Atheriniformes | Aterynokształtne |
| Atheris squamigera | Gałęźnica szorstkołuska |
| atherosclerosis | miażdżyca |
| atherosclerotic disease | miażdżyca |
| Athetosis | Atetoza |
| Athina Livanos | Athina Liwanos |
| Athirson Mazzoli de Oliveira | Athirson |
| Athirson Mazzoli e Oliveira | Athirson |
| Athis-Mons | Athis-Mons |
| athlete | sportowiec |
| Athletic Bilbao | Athletic Bilbao |
| athletics | lekkoatletyka |
| Athlitiki Enosis Konstantinoupoleos | AEK Ateny |
| Athlon | AMD Athlon |
| Atholl | Atol |
| Athos | Atos |
| Athos-Aspis | Athos-Aspis |
| Athribis | Athribis |
| Athyrium | Wietlica samicza |
| Athyrium filix-femina | Wietlica samicza |
| Ati | Ati |
| ATI CrossFire | CrossFire |
| ATI Technologies | ATI Technologies |
| Atia Balba Caesonia | Atia Starsza |
| Atiku Abubakar | Atiku Abubakar |
