| Seatpost | Sztyca rowerowa |
| Seattle | Seattle |
| Seattle Mariners | Seattle Mariners |
| Seattle Seahawks | Seattle Seahawks |
| Seattle Storm | Seattle Storm |
| Seattle SuperSonics | Seattle SuperSonics |
| Seattle Thunderbirds | Seattle Thunderbirds |
| Seattle-Tacoma International Airport | Port lotniczy Seattle-Tacoma |
| seaweed | glon |
| Seawolf class submarine | Okręty podwodne typu Seawolf |
| Sebastes | Sebastes |
| Sebastian | Sebastian |
| Sebastian Brant | Sebastian Brant |
| Sebastian Cabot | Sebastiano Caboto |
| Sebastian Kehl | Sebastian Kehl |
| Sebastian Klonowic | Sebastian Fabian Klonowic |
| Sebastian Kneipp | Sebastian Kneipp |
| Sebastian of Portugal | Sebastian I Aviz |
| Sebastian Vettel | Sebastian Vettel |
| Sebastiane | Sebastian |
| Sebastianism | Sebastianizm |
| Sebastiano del Piombo | Sebastiano del Piombo |
| Sebastiano Serlio | Sebastiano Serlio |
| Sebastiano Ziani | Sebastiano Ziani |
| Sebastianus | Sebastianus |
| Sebastián Lerdo de Tejada | Sebastián Lerdo de Tejada |
| Sebastián Leto | Sebastián Leto |
| Sebastián Rulli | Sebastián Rulli |
| Sebedín-Bečov | Sebedín-Bečov |
| Sebezh | Siebież |
| Sebeş | Sebeş |
| Sebiş | Sebiş |
| Seborga | Seborga |
| Sebou River | Wadi Subu |
| sebum | łój |
| sec | sec |
| Secale | Żyto |
| SECAM | SECAM |
| secant | sieczna |
| Secant method | Metoda siecznych |
| Secernosaurus | Sekernozaur |
| secession | secesja |
| Sechura Fox | Lis sechura |
| Secodontosaurus | Sekodontozaur |
| second | drugi |
| Second Age | Druga Era |
| Second Anglo-Dutch War | II wojna angielsko-holenderska |
| Second Balkan War | II wojna bałkańska |
| Second Battle of Bull Run | Druga bitwa nad Bull Run |
| Second Battle of El Alamein | II bitwa pod El Alamein |
| Second Battle of Heligoland Bight | Bitwa pod Helgolandem |
| Second Battle of Kharkiv | Bitwa pod Demiańskiem |
| Second Battle of Kharkov | Bitwa pod Demiańskiem |
| Second Battle of Newbury | Bitwa pod Newbury |
| Second Battle of the Isonzo | Bitwy nad Isonzo |
| Second Battle of the Marne | I bitwa nad Marną |
| Second Battle of Zürich | II bitwa pod Zurychem |
| Second Boer War | Wojny burskie |
| Second Cabinet of Marek Belka | Drugi rząd Marka Belki |
| Second Chechen War | II wojna czeczeńska |
| Second Council of Constantinople | Sobór Konstantynopolitański II |
| Second Council of Lyon | Sobór Lyoński II |
| Second Council of Nicaea | Sobór Nicejski II |
| Second Council of the Lateran | Sobór Laterański II |
| second course | drugie |
| Second Crusade | II wyprawa krzyżowa |
| Second dynasty of Egypt | II dynastia |
| Second French Empire | II Cesarstwo Francuskie |
| Second generation computer | Komputer drugiej generacji |
| second helping | dokładka |
| Second International | Druga Międzynarodówka |
| Second Italian War of Independence | Wojna francusko-austriacka |
| Second law of thermodynamics | Druga zasada termodynamiki |
| Second Life | Second Life |
| Second Macedonian War | II wojna Rzymu z Macedonią |
| second of arc | sekunda kątowa |
| Second Opium War | Druga wojna opiumowa |
| second person | druga osoba |
| Second Polish Republic | II Rzeczpospolita |
| second power | kwadrat |
| Second Punic War | II wojna punicka |
| Second Republic | II Republika Francuska |
| Second Sino-Japanese War | Wojna chińsko-japońska |
| Second Triumvirate | II triumwirat |
| Second Vatican Council | Sobór Watykański II |
| Second Vermont Republic | Druga Republika Vermontu |
| Second Viennese School | Druga szkoła wiedeńska |
| Second war of Kappel | II wojna kappelska |
| Second World | Drugi Świat |
| Second World War | II wojna światowa |
