| aphorism | adagio |
| aphoristic | axiomático |
| aphrodisiac | afrodisíaco |
| Aphrodisias | Afrodisias |
| Aphrodite | Afrodita |
| Aphrodite of Cnidus | Venus de Cnido |
| Aphrodite Terra | Aphrodite Terra |
| Aphthonius of Antioch | Aftonio |
| Aphyllanthaceae | Aphyllanthaceae |
| API | Application Programming Interface |
| Apia | Apia |
| Apiaceae | Apiaceae |
| Apiales | Apiales |
| apiary | colmenar |
| Apical meristem | Tejidos meristemáticos |
| Apicius | Marco Gavio Apicio |
| Apicomplexa | Apicomplexa |
| apiculture | apicultura |
| apiculturist | apicultor |
| Apidae | Apidae |
| apiece | cada uno |
| Apimondia | Federación Internacional de Asociaciones de Apicultura |
| Apinae | Apinae |
| Apion | Apión |
| Apirak Kosayothin | Apirak Kosayothin |
| Apis andreniformis | Apis andreniformis |
| Apis cerana | Apis cerana |
| Apis cerana nuluensis | Apis nulensis |
| Apis dorsata | Apis dorsata |
| Apis florea | Apis florea |
| Apis koschevnikovi | Apis koschevnikovi |
| Apis mellifera capensis | Apis mellifera capensis |
| Apisai Ielemia | Apisai Ielemia |
| Apitoxin | Apitoxina |
| Apium | Apium |
| APL | APL |
| Aplacophora | Aplacophora |
| Aplao District | Distrito de Aplao |
| Aplastic anemia | Anemia aplásica |
| Aplomado Falcon | Falco femoralis |
| aplomb | aplomo |
| Apoapsis | Apoastro |
| Apocalypse | Apocalipsis |
| Apocalypse Now | Apocalypse Now |
| Apocalypse of Peter | Apocalipsis de Pedro |
| apocalyptic | apocalíptico |
| Apocalyptic literature | Apocalipsis |
| Apocalypto | Apocalypto |
| Apocenter | Apocentro |
| Apocrine sweat glands | Glándula exocrina |
| Apocrisiarius | Apocrisiario |
| Apocrita | Apocrita |
| Apocrypha | libros apócrifos |
| apocryphal | apócrifo |
| Apocryphon of John | Evangelio apócrifo de Juan |
| Apocynaceae | Apocynaceae |
| Apocynum cannabinum | Apocynum cannabinum |
| Apodaca | Apodaca |
| Apodiformes | Apodiformes |
| Apodization | Apodización |
| APOEL FC | APOEL FC |
| apogee | apogeo |
| Apogee Software | Apogee Software |
| Apoidea | Apoidea |
| Apokolips | Apokolips |
| Apolinario Mabini | Apolinario Mabini |
| Apolipoprotein | Apolipoproteina |
| apolitical | apolítico |
| Apollinarism | Apolinarismo |
| Apollo | Apolo |
| Apollo and Daphne | Apolo y Dafne |
| Apollo asteroid | Asteroides Apolo |
| Apollo Belvedere | Apolo de Belvedere |
| Apollo et Hyacinthus | Apollo et Hyacinthus |
| Apollo group | Grupo Apolo |
| Apollo Lunar Surface Experiments Package | ALSEP |
| Apollo Moon Landing hoax accusations | Acusaciones de falsificación en los alunizajes del Programa Apolo |
| Apollo Mussin-Pushkin | Apollo Mussin-Pushkin |
| Apollo program | Programa Apolo |
| Apollo Sauroctonos | Apolo Sauróctono |
| Apollo spacecraft | Nave Apolo |
| Apollo Theater | Teatro Apollo |
| Apollo-Soyuz Test Project | Apolo-Soyuz |
| Apollodorus | Apolodoro de Atenas |
| Apollodorus of Carystus | Apolodoro de Caristos |
| Apollodorus of Damascus | Apolodoro de Damasco |
| Apollodotus I | Apolodoto I |
| Apollon Limassol | Apollon Limassol |
| Apollonius | Apolonio |
| Apollonius Molon | Apolonio |
| Apollonius of Perga | Apolonio de Perge |
| Apollonius of Rhodes | Apolonio de Rodas |
| Apollonius of Tralles | Apolonio |
| Apollonius of Tyana | Apolonio de Tiana |
| Apollyon | Apolión |
| apologetic | apologético |
