| sinnlig | carnal |
| sinnlighet | sensuousness |
| sinnrik | ambidextrous |
| sinologi | sinology |
| Sinop | Sinop Province |
| Sinope | Sinope |
| Sinosaurus | Sinosaurus |
| Sinotibetanska språk | Sino-Tibetan languages |
| sinsemellan | together |
| Sinsemilla | Cannabis cultivation |
| Sint Eustatius | Sint Eustatius |
| Sint Maartens fotbollslandslag | Sint Maarten national football team |
| Sinter | Calc-sinter |
| Sinterklaas | Saint Nicholas |
| Sinti | Sinti |
| Sinuhe egyptiern | The Egyptian |
| Sinuiju | Sinuiju |
| sinuit | sinusitis |
| sinus | sine |
| Sinusbradykardi | Sinus bradycardia |
| sinusformad | sinusoidal |
| sinusit | sinusitis |
| Sinussatsen | Law of sines |
| sinusvåg | sine wave |
| Siobhán Donaghy | Siobhán Donaghy |
| sion | zion |
| sionism | Zionism |
| sionist | zionist |
| Sions Sånger | Siionin Virret |
| Sions vises protokoll | The Protocols of the Elders of Zion |
| Sioux County | Sioux County |
| Siouxsie Sioux | Siouxsie Sioux |
| siouxspråk | Sioux |
| Sipalay | Sipalay City |
| Sipo | Sicherheitspolizei |
| sippa | anemone |
| Sippar | Sippar |
| sipphet | coyness |
| Sippora | Zipporah |
| sippra | drip |
| sippra ut | transpire |
| sipprade | oozed |
| Sippruta | Thalictrum thalictroides |
| SIPRI | Stockholm International Peace Research Institute |
| Siptah | Siptah |
| Sir | Sir |
| Sir Hector Macdonald | Hector MacDonald |
| Sir Henry and his Butlers | Sir Henry And His Butlers |
| Sir Josiah Child | Josiah Child |
| Sir William Jones | William Jones |
| Sir-Tech | Sir-Tech |
| sira | ornament |
| Sirajganj | Sirajganj |
| sirap | molasses |
| siraps- | treacly |
| sirapsaktig | syrupy |
| Sirapskatastrofen i Boston | Boston Molasses Disaster |
| Sirdal kommun | Sirdal |
| siren | siren |
| sirendjur | sea cow |
| Sirener | Siren |
| Sirenerna på Titan | The Sirens of Titan |
| Sirhan Sirhan | Sirhan Sirhan |
| Siricius | Pope Siricius |
| Sirimavo Bandaranaike | Sirimavo Bandaranaike |
| Sirin | Sirin |
| Sirio | Sirio |
| Sirius | Sirius |
| Sirius Black | Sirius Black |
| Sirjan | Sirjan |
| Sirkap | Taxila |
| sirlig | graceful |
