| sea | hav |
| sea anemone | søanemone |
| Sea cucumber | Søpølser |
| Sea cucumbers | Søpølser |
| sea horse | søhest |
| Sea kayak | Havkajak |
| Sea kayaking | Havkajak |
| sea level | havoverflade |
| sea lion | søløve |
| Sea mammal | Vandlevende pattedyr |
| Sea mark | Sømærke |
| Sea mine | Sømine |
| Sea of Azov | Azovske Hav |
| Sea of Galilee | Genesaret sø |
| Sea of Japan | Japanske Hav |
| Sea of Marmara | Marmarahavet |
| Sea of Marmora | Marmarahavet |
| Sea of Okhotsk | Okhotske Hav |
| Sea Otter | Havodder |
| Sea Peoples | Havfolkene |
| Sea traffic | Navigation |
| sea urchin | søpindsvin |
| sea water | havvand |
| Sea wave | Bølge |
| Sea-bream | Guldfisken |
| Sea-lion | Øresæler |
| Sea-mist | Tåge |
| Sea-Monkey | Saltsøkrebs |
| Sea-nymph | Havfrue |
| Sea-shell | Snegl |
| sea-worthy | sødygtig |
| seabed | havbund |
| seaborgium | seaborgium |
| seagull | måge |
| Seahorse | Søhest |
| Seakale | Strandkål |
| seal | sæl |
| Seal of quality | Pladeselskab |
| Sealand | Sealand |
| seaman | sømand |
| Seamark | Fyr |
| seamstress | sypige |
| Sean Combs | Sean Combs |
| Sean Connery | Sean Connery |
| Sean Paul | Sean Paul |
| Sean Penn | Sean Penn |
| Sean Taylor | Sean Taylor |
| Seann William Scott | Seann William Scott |
| seaplane | vandfly |
| SeaQuest DSV | SeaQuest DSV |
| search | ransage |
| Search and rescue | Search and rescue |
| Search engine | Søgemaskine |
| Sears Tower | Sears Tower |
| seashell | konkylie |
| seashore | strand |
| seasick | søsyg |
| seasickness | søsyge |
| seaside | kyst |
| season | årstid |
| seasoning | krydre |
| SEAT Alhambra | Seat Alhambra |
| SEAT Altea | Seat Altea |
| seat belt | sikkerhedssele |
| SEAT Córdoba | Seat Cordoba |
| Seattle | Seattle |
| Seattle Mariners | Seattle Mariners |
| Seattle Seahawks | Seattle Seahawks |
| Seattle-Tacoma International Airport | Seattle-Tacoma International Airport |
| Seaurchin | Søpindsvin |
| seawater | havvand |
| seaweed | tang |
| Seaweeds | Bændeltang |
| Sebastian | Sebastian |
| Sebastian of Portugal | Sebastian |
| Sebastian Vettel | Robert Kubica |
| SECAM | SECAM |
| second | anden |
| Second Battle of Bull Run | Andet slag ved Bull Run |
| Second Battle of El Alamein | Andet slag om el-Alamein |
| Second Battle of Fallujah | Slaget om Fallujah |
| Second Battle of Kharkiv | Demjanskkedlen |
| Second Battle of Kharkov | Demjanskkedlen |
| Second Boer War | Boerkrigen |
| Second generation computer | Andengenerationsdatamat |
| Second hand bookshop | Antikvariat |
| Second International | Anden Internationale |
| Second Life | Second Life |
| Second offence | Recidivitet |
| Second Opium War | Anden opiumskrig |
| Second Punic War | Anden puniske krig |
| Second Sino-Japanese War | Anden kinesisk-japanske krig |
| Second Temple | Det Andet Tempel |
| second time | anden gang |
| Second Vatican Council | Det andet Vatikankoncil |
| Second Viennese School | Anden Wienerskole |
| Second World | Den anden verden |
| secondary education | højere uddannelse |
| secret | hemmelig |
| Secret Garden | Secret Garden |
| Secret sharing | Secret Sharing |
| Secret State Police | Gestapo |
| Secret Window | Secret Window |
| Secretarial staff | Filmhold |
| secretariat | sekretariat |
| secretary | skriver |
| Secretary of State | Statssekretær |
| Secretarybird | Sekretærfugl |
| secrete | udelukke |
| secretive | hemmelighedsfuld |
| sect | sekt |
| Secular state | Sekulær stat |
| Securable | Erlangen |
| Secure Digital card | Secure Digital |
| Securing screw | Skrue |
| Securitate | Securitate |
| security | sikkerhed |
| Security cracking | Cracker |
| Security dilemma | Sikkerhedsdilemma |
| security guard | sikkerhedsvagt |
| security theater | sikkerhedsteater |
| Security token | Security Token Service |
| Seda | Silke |
| Seder | Seder |
| Sedges | Star-slægten |
| sediment | bundfald |
| Sedimentary deposition | Sediment |
| sedimentation | sedimentering |
