| sectoriel | sektorowy |
| Secure copy | SCP |
| Secure File Transfer Protocol | SFTP |
| Secure shell | SSH |
| Secure socket layer | SSL |
| Securitate | Securitate |
| Securities and Exchange Commission | United States Securities and Exchange Commission |
| Security Service | Security Service |
| Sed | Sed |
| Sedan | Sedan |
| Sedecias | Sedecjasz |
| Sedimentation | Osady |
| Sedov | Siedow |
| Sedum | Rozchodnik |
| Seefeld | Seefeld |
| Seeing | Seeing |
| Seeland | Zelandia |
| Seelow | Seelow |
| Seewald | Seewald |
| Seewis im Prättigau | Seewis im Prättigau |
| Sefer Ha Zohar | Zohar |
| Sefer Torah | Sefer Tora |
| Sefid Roud | Sefid Rud |
| Sega | Sega |
| Sega Pico | Pico |
| Segisaurus | Segizaur |
| Segment de population | Segmentacja rynku |
| Segmentation stratégique | Segmentacja rynku |
| Segni | Segni |
| Segnosaurus | Segnozaur |
| Segny | Ségny |
| Segovie | Segowia |
| Segrià | Segrià |
| Seguia el-Hamra | Sakija al-Hamra |
| Segundo Castillo | Segundo Castillo |
| Segura | Segura |
| Segway PT | Segway HT |
| seiche | kalmar |
| Seiche commune | Mątwa zwyczajna |
| Seiches lémaniques | Sejsza |
| Seif el Islam Kadhafi | Saif al-Islam al-Kadafi |
| seigle | żyto |
| Seigneur | Pan |
| Seigneux | Seigneux |
| Seigo Narazaki | Seigo Narazaki |
| Seiken densetsu | Mana |
| Seimas | Sejm litewski |
| sein | biust |
| Seine | Sekwana |
| Seine-et-Marne | Seine-et-Marne |
| Seine-Maritime | Seine-Maritime |
| Seine-Saint-Denis | Seine-Saint-Denis |
| Seinen | Seinen |
| Seinfeld | Kroniki Seinfelda |
| seismographe | sejsmograf |
| seismologiste | sejsmolog |
| Seismosaurus | Sejsmozaur |
| Seiwa | Seiwa |
| Seixal | Seixal |
| Seiyū | Seiyū |
| seize | szesnaście |
| Seize Royaumes | Szesnaście Królestw |
| Sejm | Sejm Rzeczypospolitej Polskiej |
| Sekhmet | Sechmet |
| Sekyere ouest | Sekyere West |
| sel | sól |
| Sel alimentaire | Sól kuchenna |
| sel d'épandage | sól do posypywania dróg |
| sel de la Terre | sól ziemi |
| Sel de Mohr | Sól Mohra |
| sel de table | sól kuchenna |
| Selaginella | Widliczka |
| Selay | Manhunt |
| Selb | Selb |
| Seldjoukides | Sułtanat seldżucki |
| Selena | Selena |
| SELENE | Kaguya |
| Selenga | Selenga |
| Self | Cewka |
| self-service | samoobsługa |
| selfie | samojebka |
| Selfoss | Selfoss |
| Selim Benachour | Selim Ben Achour |
| Selim Ier | Selim I Groźny |
| Selim II | Selim II |
| Selim III | Selim III |
| SELinux | Security-Enhanced Linux |
| Selkis | Selkit |
| Sellapan Rama Nathan | Sellapan Rama Nathan |
| selle | siodełko |
| Selle français | Selle français |
| Selle turcique | Siodło tureckie |
| seller | siodłać |
| selles | kał |
| sellette | siodło |
| sellier | siodlarz |
| Selma | Selma |
| Selma Lagerlöf | Selma Lagerlöf |
| Selman Abraham Waksman | Selman Waksman |
| Selmasongs | Selmasongs |
| selon | według |
| sels | sól |
| Seltjarnarnes | Seltjarnarnes |
| Seltse | Selce |
| Selva dei Molini | Selva dei Molini |
| Selva di Val Gardena | Selva di Val Gardena |
| Sem | Sem |
| Semacode | Semacode |
| Semaille | Zasiew |
| semaine | tydzień |
| Semaine Sainte | Wielki Tydzień |
| Semarang | Semarang |
| semblable | podobny |
| sembler | wyglądać |
| Sembler raisonnable | Zsumować |
| Sembrancher | Sembrancher |
| semeler | podzelować |
| semelle | podeszwa |
| semence | nasienie |
| Semence de lin | Linosa |
| Sementina | Sementina |
| semer | siać |
