| sigillack | lacre |
| Sigillkunskap | Sigilografía |
| Sigirino | Sigirino |
| Sigiriya | Sigiriya |
| Sigismund | Segismundo Vasa |
| Sigismund av Burgund | Segismundo del Sacro Imperio Romano Germánico |
| Sigismund av Ungern | Segismundo del Sacro Imperio Romano Germánico |
| Sigismund I av Polen | Segismundo I Jagellón el Viejo |
| Sigismund II August | Segismundo II Augusto Jagellón |
| Sigismund Thalberg | Sigismund Thalberg |
| sigma | sigma |
| Sigma Corporation | Sigma Corporation |
| Sigma-algebra | Sigma-álgebra |
| Sigmund | Segismundo Vasa |
| Sigmund Freud | Sigmund Freud |
| Sigmund Jähn | Sigmund Jähn |
| Sign Of The Hammer | Sign Of The Hammer |
| signa | consagrar |
| signal | señal |
| Signal Iduna Park | Signal Iduna Park |
| Signalbehandling | Procesamiento de señales |
| signalement | descripción |
| signalera | indicar |
| signalhorn | bocina |
| Signalprocessor | Procesador digital de señal |
| Signalspaning | ELINT |
| Signalsubstans | Neurotransmisor |
| signatur | firma |
| Signau | Distrito de Signau |
| signera | endosar |
| signet | sello |
| signifikans | significado |
| signifikant | importante |
| Signumfunktionen | Función signo |
| Signy-Avenex | Signy-Avenex |
| Sigourney Weaver | Sigourney Weaver |
| Sigrid Undset | Sigrid Undset |
| Sigriswil | Sigriswil |
| Sigtuna | Sigtuna |
| Sigtuna kommun | Sigtuna |
| Sigur Rós | Sigur Rós |
| Sigurd | Sigfried |
| Sigurd Fafnesbane | Sigfried |
| Sigurd Jorsalafarare | Sigurd I |
| Sigurimi | Sigurimi |
| Sigurjón Birgir Sigurðsson | Sigurjón Birgir Sigurðsson |
| Sigvard Bernadotte | Sigvard Bernadotte |
| Sigyn | Sigyn |
| Sihanoukville | Ciudad de Sihanoukville |
| Sihl | Sihl |
| SIIC | Asamblea Suprema para la Revolución Islámica en Iraq |
| Siirt | Provincia de Siirt |
| sik | farra |
| Sikahjort | Cervus nippon |
| Sikaner | Sicanos |
| Sikar | Corégono |
| Sikeler | Sículos |
| sikh- | sij |
| Sikhism | Sikhismo |
| Sikkim | Sikkim |
| siklöja | coregono blanco |
| Sikorsky | Sikorsky Aircraft |
| sikt | colador |
| sikta | esforzarse |
| sikta till | echar el ojo a |
| sikte | intención |
| Siku | Sicu |
| sil | colador |
| SIL International | SIL International |
| sila | escurrir |
| Silan | Silano |
| Silbo Gomero | Silbo gomero |
| Sildenafil | Sildenafil |
| Silence is Easy | Silence Is Easy |
| Silener | Sileno |
| Silent Hill | Silent Hill |
| Silenus | Sileno |
| sileshår | drosera |
| silicium | silicio |
| siliciumchips | cápsula de silicio |
| Silicon Graphics | Silicon Graphics |
| Silicon Valley | Silicon Valley |
| silikat | silicato |
