| Atkinson cycle | Ciclo Atkinson |
| Atl | Atl |
| Atlacamani | Atlacamani |
| Atlacoya | Atlacoya |
| Atlant-Soyuz Airlines | Atlant-Soyuz Airlines |
| Atlanta | Atlanta |
| Atlanta Braves | Atlanta Braves |
| Atlanta Campaign | Campagna di Atlanta |
| Atlanta Falcons | Atlanta Falcons |
| Atlanta Hawks | Atlanta Hawks |
| Atlanta Thrashers | Atlanta Thrashers |
| Atlante Fútbol Club | CF Atlante |
| Atlantean | Atlantico |
| Atlantean language | Atlantiano |
| Atlantic | Atlantico |
| Atlantic Beach | Atlantic Beach |
| Atlantic bonito | Bonito |
| Atlantic City | Atlantic City |
| Atlantic Division | Atlantic Division |
| Atlantic Herring | Clupea harengus |
| Atlantic horse mackerel | Trachurus trachurus |
| Atlantic mackerel | Scomber scombrus |
| Atlantic Northern Right Whale | Eubalaena glacialis |
| Atlantic Ocean | Atlantico |
| Atlantic Puffin | Fratercula arctica |
| Atlantic salmon | Salmo salar |
| Atlantic slave trade | Tratta degli schiavi africani |
| Atlantic Spotted Dolphin | Stenella frontalis |
| Atlantic Wall | Vallo Atlantico |
| Atlantic White-sided Dolphin | Lagenorhynchus acutus |
| Atlantica | Atlantica |
| Atlanticism | Atlantismo |
| Atlantique Department | Atlantique |
| Atlantis | Atlantide |
| Atlantis II | Atlantide |
| atlas | atlante |
| Atlas Bear | Ursus arctos crowtheri |
| Atlas Cedar | Cedrus atlantica |
| ATLAS experiment | Esperimento Atlas |
| Atlas Mountains | Atlante |
| Atlascopcosaurus | Atlascopcosaurus loadsi |
| Atlasjet | Atlasjet |
| Atlatonin | Atlatonin |
| Atlaua | Atlaua |
| Atlántico | Atlántico |
| Atlántico Department | Atlántico |
| Atlántida | Atlantide |
| Atlético Madrid | Atlético de Madrid |
| Atlético Nacional | Corporación Deportiva Club Atlético Nacional |
| ATM | ATM |
| atman | battelliere |
| Atmel AVR | Atmel AVR |
| atmosphere | atmosfera |
| Atmosphere of Mars | Atmosfera di Marte |
| Atmosphere of Venus | Atmosfera di Venere |
| atmospheric | atmosferico |
| atmospheric aerosol | aerosol atmosferico |
| atmospheric chemistry | chimica dell'atmosfera |
| atmospheric circulation | circolazione atmosferica |
| atmospheric component | componenti dell'atmosfera |
| atmospheric composition | composizione dell'atmosfera |
| atmospheric correction | correzione atmosferica |
| Atmospheric density | Densità atmosferica |
| Atmospheric dispersion modeling | Dispersione degli inquinanti in atmosfera |
| Atmospheric diving suit | Atmospheric Diving Suit |
| atmospheric emission | emissioni atmosferiche |
| atmospheric fallout | ricaduta atmosferica |
| atmospheric layering | stratificazione atmosferica |
| atmospheric monitoring | monitoraggio dell'atmosfera |
| atmospheric ozone | ozono atmosferico |
| atmospheric particulate | materiale particolato atmosferico |
