| significance | significado |
| significant | notable |
| significant other | novia |
| significantly | sustancialmente |
| signification | significado |
| signifies | significa |
| signify | indicar |
| signifying | cuantioso |
| signor | sr |
| signors | caballeros |
| signpost | hito |
| signs | signo |
| Signs Gospel | Evangelio de los Signos |
| Signy-Avenex | Signy-Avenex |
| Sigourney Weaver | Sigourney Weaver |
| Sigrid Undset | Sigrid Undset |
| Sigriswil | Sigriswil |
| Sigtuna | Sigtuna |
| Sigtuna Municipality | Sigtuna |
| Sigur Rós | Sigur Rós |
| Sigurd | Sigfried |
| Sigurd I of Norway | Sigurd I |
| Sigurd II of Norway | Sigurd II |
| Sigurd Slembe | Sigurd Slembe |
| Sigurd Wongraven | Sigurd Wongraven |
| Sigurimi | Sigurimi |
| Sigurður Nordal | Sigurður Nordal |
| Sigyn | Sigyn |
| Sihanoukville | Ciudad de Sihanoukville |
| Sihl | Sihl |
| Sihlsee | Lago del Sihl |
| Sihuas | Sihuas |
| Sihuas District | Distrito de Sihuas |
| Sihuas Province | Provincia de Sihuas |
| Siilitie metro station | Estación Siilitie |
| Siirt Province | Provincia de Siirt |
| Sikh | sij |
| Sikhism | Sikhismo |
| Sikhote-Alin | Sijote-Alin |
| Sikkim | Sikkim |
| Sikorsky Aircraft | Sikorsky Aircraft |
| Siku | Sicu |
| SIL International | SIL International |
| Sila | Sila |
| silage | ensilaje |
| Silas | Fuerza |
| Silat | Pencak silat |
| Silbannacus | Silbanaco |
| Silbervogel | Silbervogel |
| Silbo Gomero language | Silbo gomero |
| Sileighty | Sileighty |
| silence | secreto |
| Silence Is Easy | Silence Is Easy |
| silence is golden | el silencio es oro |
| Silence-Lotto | Silence-Lotto |
| silencer | silenciador |
| silencing | callado |
| Silene acaulis | Silene acaulis |
| Silene coronaria | Silene coronaria |
| Silene vulgaris | Silene vulgaris |
| Silenen | Silenen |
| silent | callar |
| silent film | cine mudo |
| Silent Hill | Silent Hill |
| Silent Hill V | Silent Hill V |
| Silent Light | Luz silenciosa |
| Silent Night | Noche de paz |
| silent partner | socio capitalista |
| Silent protagonist | Protagonista silencioso |
| Silent Running | Naves misteriosas |
| silently | silencioso |
| silentness | sosiego |
| Silesia | Silesia |
| Silesia football team | Selección de fútbol de Silesia |
| Silesian Stadium | Estadio de Silesia |
| Silesian Voivodeship | Silesia |
| Silesian Voivodship | Silesia |
| Silesian Wars | Guerras de Silesia |
| silhouette | contorno |
| Silhouette Island | Isla de Silhouette |
| silica | sílice |
| silicate | silicato |
| siliceous | silíceo |
| Siliceous earth | Dióxido de silicio |
| Silicium | Silicio |
| silicon | silicio |
| Silicon burning | Fusión del silicio |
| silicon chip | cápsula de silicio |
| silicon dioxide | dióxido del silicio |
| Silicon Graphics | Silicon Graphics |
| Silicon on insulator | Silicon on insulator |
| Silicon star | Estrella de silicio |
| Silicon Valley | Silicon Valley |
| silicone | silicona |
| silicosis | silicosis |
| Silingi | Silingos |
| silique | vaina |
| Silius Italicus | Silio Itálico |
| Siljan | Siljan |
| silk | seda |
