| Thales | Tales de Mileto |
| Thalestris | Talestris |
| Thalia | Talía |
| Thaliacea | Thaliacea |
| thalidomide | talidomida |
| thalidomide baby | bebé talidomida |
| thallium | talio |
| thalweg | vaguada |
| Thalys | Thalys |
| Thalía | Thalía |
| Thames | Támesis |
| Thames - the | Támesis |
| Thammasat University | Universidad de Thammasat |
| Thamyris | Tamiris |
| than | que |
| Than Shwe | Than Shwe |
| thanatophobia | tanatofobia |
| Thanatos | Tánatos |
| Thandie Newton | Thandie Newton |
| thank | agradecer |
| thank goodness | ¡gracias a dios! |
| thank you | gracias |
| Thank You for Smoking | Gracias por fumar |
| Thank You for the Music | Thank you for the Music |
| thank you in advance | gracias de antemano |
| thank you so much | gracias |
| thank you very much | gracias |
| thank-you | gracias |
| thankful | agradecido |
| thankfully | afortunadamente |
| thankfulness | reconocimiento |
| thanking | gracias |
| thanking you in advance | agradeciéndole de antemano |
| thankless | ingrato |
| thanks | gracias |
| thanks a lot | gracias |
| thanks a million | gracias |
| thanks ever so much | gracias |
| thanks for nothing | gracias por nada |
| thanks for your help | gracias por su ayuda |
| thanks to | por |
| Thanksgiving | Día de Acción de Gracias |
| Thanksgiving Day | Día de Acción de Gracias |
| Thapsacus | Tapsaco |
| Thar Desert | Desierto de Thar |
| Tharapita | Tharapita |
| Thargelia | Targelias |
| Tharsis | Tharsis |
| Tharsis Montes | Tharsis Montes |
| Thasos | Tasos |
| that | que |
| that can be taken apart | separable |
| that is | a saber |
| that is to say | es decir |
| That kind of | Tell |
| that much | tanto |
| that must be given back | restituible |
| That Obscure Object of Desire | Ese oscuro objeto del deseo |
| that one | ése |
| that over there | eso |
| that ship has sailed | ese barco ya zarpó |
| that was it | eso fue todo |
| that way | así |
| that which | lo que |
| that'll be the day | el día que la vaca vuele |
| that's all | para de contar |
| that's it | para de contar |
| that's right | justo |
| that's what she said | eso fue lo que ella dijo |
| thatch | cubrir con paja |
| Thaumas | Taumante |
| Thaumatin | Taumatina |
| thaumaturge | taumaturgo |
| thaw | deshelar |
| Thaïs | Tais |
| THB | Baht |
| the | el |
| The A-Team | The A-Team |
| The ABC Model of Flower Development | Desarrollo floral |
| The absurdity | Lo absurdo |
| The Abyss | The Abyss |
| The Acharnians | Los acarnienses |
| The act of kissing | Beso |
| The act of sex | Relaciones sexuales |
| The Addams Family | La Familia Addams |
| The Adoration of the Shepherds | Adoración de los Pastores |
| The Adventurer | The Adventurer |
| The Adventures of Alix | Alex |
| The Adventures of Baron Munchausen | Las aventuras del Barón Munchausen |
| The Adventures of Ford Fairlane | Las aventuras de Ford Fairlane |
| The Adventures of Robin Hood | Robin de los bosques |
| The Adventures of Sherlock Holmes | Sherlock Holmes |
| The Adventures of the Galaxy Rangers | Guardianes de la Galaxia |
| The Adventures of Tintin | Las aventuras de Tintín |
| The Adventures of Tom Bombadil | Las aventuras de Tom Bombadil |
| The Adventures of Tom Sawyer | Las aventuras de Tom Sawyer |
| The Afghan Whigs | The Afghan Whigs |
| The African Queen | La Reina de África |
| The Age of Innocence | La edad de la inocencia |
| The Age of Spiritual Machines | La era de las máquinas espirituales |
| The Alamo | El Álamo |
| The Alan Parsons Project | The Alan Parsons Project |
| The Alchemist | El alquimista |
| The Aleph | El Aleph |
| The algebra of sets | Teoría de conjuntos |
| The All-American Rejects | The All-American Rejects |
| The Alliance | La Alianza |
| The Allman Brothers Band | Allman Brothers Band |
| The Amazing Race | The Amazing Race |
| The Ambassadors | Los Embajadores |
| The Amber Spyglass | El catalejo lacado |
