| at the side of | al lado de |
| At the Speed of Life | At The Speed Of Life |
| At the table | A la mesa |
| at the time | de la época |
| at the top | arriba |
| at the very height of | al momento cumbre de |
| at the very last minute | justo a tiempo |
| at the very last second | justo a tiempo |
| at this moment | actualmente |
| At wt | Masa atómica |
| at your convenience | cuando sea conveniente |
| At your disposal | A la disposición de Usted |
| at your leisure | cuando sea conveniente |
| At your service | A la disposición de Usted |
| AT-AT | AT-AT |
| at-home | recepción |
| At-sign | Orthogastropoda |
| AT-ST | AT-ST |
| At-Tawba | At-Tawba |
| ATA | Integrated Drive Electronics |
| ATA over Ethernet | Ata over ethernet |
| Atabeg | Atabeg |
| Atacama | Desierto de Atacama |
| Atacama Desert | Desierto de Atacama |
| Atacama Region | III Región de Atacama |
| Atacameño | Atacameños |
| Atahuallpa Province | Atahuallpa |
| Atahualpa | Atahualpa |
| Atahualpa Yupanqui | Atahualpa Yupanqui |
| Atakapa language | Atakapa |
| Atakora Department | Atakora |
| Atal Bihari Vajpayee | Atal Behari Vajpayee |
| Atapuerca | Sierra de Atapuerca |
| Atargatis | Derceto |
| Atari Jaguar | Atari Jaguar |
| Atari Teenage Riot | Atari Teenage Riot |
| Atari TOS | Atari TOS |
| Atatürk Olympic Stadium | Estadio Olímpico Atatürk |
| Ataulf | Ataúlfo |
| Atauro Island | Atauro |
| atavism | atavismo |
| atavistic | atávico |
| Ataxia telangiectasia | Ataxia telangiectasia |
| ATB | ATB |
| Atbash | Atbash |
| ATC | ATC |
| ATC code A | Código ATC A |
| ATC code B | Código ATC B |
| ATC code C | Código ATC C |
| ATC code D | Código ATC D |
| ATC code G | Código ATC G |
| ATC code H | Código ATC H |
| ATC code J | Código ATC J |
| ATC code L | Código ATC L |
| ATC code M | Código ATC M |
| ATC code N | Código ATC N |
| ATC code P | Código ATC P |
| ATC code R | Código ATC R |
| ATC code S | Código ATC S |
| ATC code V | Código ATC V |
| Ate District | Distrito de Ate |
| Atelidae | Atelidae |
| Atelinae | Atelidae |
| Atelophryniscus | Atelophryniscus |
| Atelopus | Atelopus |
| Aten | Atón |
| Aten asteroid | Asteroides Atón |
| Atenas De San Carlos | Club Atlético Atenas de San Carlos |
| Ateneo de Manila University | Universidad Ateneo de Manila |
| Atenolol | Atenolol |
| Aterciopelados | Aterciopelados |
| Aterian | Ateriense |
| Atez | Atez |
| Athabasca Oil Sands | Arenas del aceite de Athabasca |
| Athabasca River | Río Athabasca |
| Athabaskan languages | Lenguas atabascanas |
| Athalaric | Atalarico |
| Athame | Athame |
| Athanagild | Atanagildo |
| Athanaric | Atanarico |
| Athanasios Eftaxias | Athanasios Eftaxias |
| Athanasios Miaoulis | Athanasios Miaulis |
| Athanasius Kircher | Athanasius Kircher |
| Atharvaveda | Atharvaveda |
| atheism | ateísmo |
| atheist | ateo |
| Atheist Alliance International | Premio Richard Dawkins |
| atheistic | ateo |
| Athelas | Athelas |
| Athelstan of England | Athelstan |
| Athena | Atenea |
| Athena and Phevos | Athenà y Phèvos |
| Athenagoras | Patriarca Atenágoras I |
| Athenagoras of Athens | Patriarca Atenágoras I |
| Athene | Atenas |
| Athene noctua | Athene noctua |
| Athenian | ateniense |
| Athenian democracy | Democracia griega |
| Athenodoros Cananites | Atenodoro Cananita |
| Athens | Atenas |
