| Thierachern | Thierachern |
| Thierhaupten | Thierhaupten |
| Thierrens | Thierrens |
| Thierry Boutsen | Thierry Boutsen |
| Thierry Henry | Thierry Henry |
| thieve | robar |
| thievery | latrocinio |
| thieves' lingo | jerga de ladrones |
| thieves' patter | jerga de ladrones |
| thigh | muslo |
| thighbone | fémur |
| thimble | dedo |
| thimbleful | dedo |
| thimblerig | trilero |
| Thimphu | Timbu |
| Thimphu District | Distrito de Thimphu |
| thin | claro |
| Thin client | Cliente liviano |
| thin coating | capa |
| Thin layer chromatography | Cromatografía en capa fina |
| Thin Lizzy | Thin Lizzy |
| thin out | aclarar |
| Thin-film transistor | TFT |
| thin-skinned | sensible |
| thine | tu |
| thing | objeto |
| thingamabob | asunto |
| thingamajig | asunto |
| thingamajigs | cachivaches |
| Thingol | Elwë |
| things | enseres |
| thingumabob | asunto |
| thingumajig | asunto |
| thingumbob | asunto |
| thingummy | asunto |
| think | estimar |
| think about | reflexionar |
| think aloud | pensar en voz alta |
| Think and Grow Rich | Piense y hágase rico |
| think better of it | pensar algo dos veces |
| think fit | ser apropiado |
| think highly of | admirar |
| think much of | admirar |
| think of | opinar acerca de |
| think out | analizar |
| think over | reflexionar |
| Think tank | Think tank |
| think the world of | admirar |
| think through | analizar |
| think twice about it | pensar algo dos veces |
| think up | concebir |
| think well of | consentir |
| thinkable | concebible |
| thinker | pensador |
| thinking | reflexión |
| Thinking machine | Computadora |
| thinly | escurrido |
| thinner | más enrarecido |
| thinning | dilución |
| Thiol | Tiol |
| Thionyl chloride | Cloruro de tionilo |
| thiosulfate | tiosulfato |
| Thiotimoline | Tiotimolina |
| thioxanthene | tioxanteno |
| third | tercero |
| Third Age | Tercera Edad del Sol |
| Third Amendment to the United States Constitution | Tercera Enmienda a la Constitución de los Estados Unidos |
| Third Battle of Kharkov | Tercera Batalla de Jarkov |
| Third Battle of the Aisne | Batalla de Axona |
| Third bridge guitar | Guitarra de tres puentes |
| Third Council of Constantinople | Tercer Concilio de Constantinopla |
| Third Council of the Lateran | Concilio de Letrán III |
| Third Council of Toledo | III Concilio de Toledo |
| Third Crusade | Tercera Cruzada |
| Third dynasty of Egypt | Dinastía III de Egipto |
| Third Dynasty of Ur | Renacimiento sumerio |
| Third Epistle of John | Tercera epístola de Juan |
| Third gender | Tercer sexo |
| Third Girl | La tercera muchacha |
| Third Intermediate Period of Egypt | Tercer periodo intermedio de Egipto |
| Third Italian War of Independence | Guerra de las Siete Semanas |
| Third Macedonian War | Guerras Macedónicas |
| Third Mithridatic War | Tercera Guerra Mitridática |
| Third normal form | Tercera forma normal |
| third party | tercera persona |
| third person | tercera persona |
| Third Punic War | Tercera Guerra Púnica |
| Third Reich | tercer Reich |
| Third Republic | Tercera República Francesa |
| Third Rome | Nueva Roma |
| Third Servile War | Tercera Guerra Servil |
| third stomach | tercer estómago |
| Third Temple | Tercer templo de Jerusalén |
| third time's a charm | a la tercera va la vencida |
| Third Way | Tercera Vía |
| Third World | Tercer Mundo |
| third-class | de tercera categoría |
| third-degree | de tercer grado |
| Third-generation programming language | Lenguaje de Tercera Generación |
| Third-party developer | Third-party |
| third-rate | de poca calidad |
| Third-rate film | Brassica rapa |
| Third-worldism | Tercermundismo |
| thirdly | en tercer lugar |
| thirds | terciar |
| thirst | sed |
| thirsty | sediento |
| thirteen | trece |
| Thirteen Colonies | Trece Colonias |
| Thirteen Days | Trece días |
| Thirteen desserts | Trece postres |
| Thirteen Senses | Thirteen senses |
| thirteenth | decimotercero |
