| Sigma | Sigma |
| Sigma Olomouc | Sigma Ołomuniec |
| Sigma-algebra | Przestrzeń mierzalna |
| Sigmar Heldenhammer | Sigmar |
| Sigmaringen | Sigmaringen |
| Sigmaringendorf | Sigmaringendorf |
| Sigmarszell | Sigmarszell |
| Sigmatismo | LISP |
| Sigmoceros lichtensteinii | Bawolec Lichtensteina |
| Sigmund Freud | Zygmunt Freud |
| Sigmund Jähn | Sigmund Jähn |
| Sign of the Hammer | Sign of the Hammer |
| Signal Iduna Park | Signal Iduna Park |
| significare | znaczyć |
| significativamente | znacznie |
| significativo | znaczący |
| significato | sens |
| Signo | Sinj |
| signora | pani |
| signore | pan |
| signori | panowie |
| Signori del sistema | Władcy Systemu |
| Signori di Mantova | Władcy Mantui |
| Signoria | Signoria |
| Signoria cittadina | Signoria |
| Signorina | Panna |
| Signs | Znaki |
| Signy-Avenex | Signy-Avenex |
| Sigourney Weaver | Sigourney Weaver |
| Sigrid Undset | Sigrid Undset |
| Sigur Rós | Sigur Rós |
| Sihanoukville | Kompong Som |
| sii preparato | czuwaj |
| sikhismo | sikhizm |
| Sikkim | Sikkim |
| Sikorsky Aircraft Corporation | Sikorsky Aircraft Corporation |
| SIL International | SIL International |
| Silandro | Silandro |
| Silano | Silany |
| Silanus | Silanus |
| Silay | Silay |
| Silbannaco | Silbannacus |
| Silbo gomero | Język silbo |
| sildenafil | sildenafil |
| Silene vulgaris | Lepnica rozdęta |
| Sileno | Lepnica |
| Silent Hill | Silent Hill |
| silenzio | cisza |
| silenziosamente | cicho |
| silenzioso | milczeć |
| Silesia | Śląsk |
| silfide | sylf |
| Silfio | Sylfion |
| silfo | sylf |
| silhouette | kontur |
| Siliana | Gubernatorstwo Siliana |
| silicato | krzemian |
| Silice | Ditlenek krzemu |
| silicio | krzem |
| Silicon Graphics | Silicon Graphics |
| Silicon Valley | Dolina Krzemowa |
| Siliconi | Silikony |
| Silingi | Silingowie |
| Silistra | Silistra |
| Siljan | Siljan |
| Silkeborg | Silkeborg |
| Silkeborg IF | Silkeborg IF |
| Silkroad Online | Silkroad Online |
| Silla | Silla |
