| synsätt | approach |
| Syntagma | Syntagma Square |
| syntaktisk | syntactic |
| syntaktiskt socker | syntactic sugar |
| syntax | syntax |
| syntes | synthesis |
| syntetisera | synthesize |
| syntetisk | artificial |
| syntetiskt framställa | synthesize |
| Syntetiskt språk | Synthetic language |
| syntetmaterial | synthetics |
| synthesizer | synthesizer |
| Synthetic Aperture Radar | Synthetic aperture radar |
| Synthpop | Synthpop |
| synvilla | illusion |
| synål | needle |
| Syphon Filter-serien | Syphon Filter |
| Syr-Darja | Syr Darya |
| syra | acid |
| syraanhydrid | acid anhydride |
| syrabindande medel | antacid |
| Syracuse | Syracuse |
| Syrah | Shiraz |
| Syraklorid | Acyl chloride |
| Syrakonstanten | Acid dissociation constant |
| Syrakusa | Syracuse |
| syre | oxygen |
