| simulé | fingido |
| Simutrans | Simutrans |
| Simvastatine | Simvastatina |
| Simão Sabrosa | Simão Sabrosa |
| Siméon | Simón |
| Siméon Denis Poisson | Siméon Denis Poisson |
| Siméon Ier de Bulgarie | Simeón I de Bulgaria |
| Siméon II de Bulgarie | Simeón de Sajonia-Coburgo Gotha |
| Simón Bolívar | Simón Bolívar |
| Simón de Rojas Clemente y Rubio | Simón de Rojas Clemente y Rubio |
| Sin After Sin | Sin After Sin |
| Sin City | Sin City |
| Sinaloa | Sinaloa |
| Sinan | Sinan |
| Sinarcas | Sinarcas |
| Sinaï | Sinaí |
| Sinbad le Marin | Simbad |
| Sincelejo | Sincelejo |
| Sinclair Lewis | Sinclair Lewis |
| sincère | explícito |
| sincèrement | sincero |
| sincères salutations | atentamente |
| sincérité | ingenuidad |
| Sind | Sind |
| Sindar | Sindar |
| Sindebele | Idioma Ndebele |
| Sindel | Sindel |
| sindhi | sindhi |
| Sindicato Nacional de Trabajadores de la Educación | Sindicato Nacional de Trabajadores de la Educación |
| sindonologie | sindonología |
| Sine qua non | Sine qua non |
| Sines | Sines |
| Sing Sing | Sing Sing |
| Sing the Sorrow | Sing the Sorrow |
| Singalais | cingalés |
| Singalaise | cingalés |
| Singapore | Singapur |
| Singapore Airlines | Singapore Airlines |
| Singapour | Singapur |
| singapourien | singapurense |
| Singapourienne | singapurense |
| singe | mono |
| singe anthropoïde | antropoide |
| Singe tête de mort | Saimiri sciureus |
| Singer Building | Singer Building |
| Singes de la sagesse | Los tres monos sabios |
| Singhalais | cingalés |
| Singhalaise | cingalés |
| Singidunum | Singidunum |
| Single | Sencillo |
| Single coil | Single coil |
| Single document interface | Interfaz de documento único |
| Single Inline Memory Module | SIMM |
| Single Instruction Multiple Data | Single Instruction Multiple Data |
| Single nucleotide polymorphism | Polimorfismo de nucleótido simple |
| Single point of failure | SPOF |
| singleton | semifallo |
| Singspiel | Singspiel |
| Singstar | SingStar |
| singularité | peculiaridad |
| Singularité de Prandtl-Glauert | Singularidad de Prandtl-Glauert |
| Singularité gravitationnelle | Singularidad espaciotemporal |
| Singularité nue | Singularidad desnuda |
| Singularité technologique | Singularidad tecnológica |
| singulatif | singulativo |
| singulier | único |
| singulièrement | extremamente |
