| common moorhen | kurka wodna |
| Common Myna | Majna brunatna |
| common nightingale | słowik rdzawy |
| Common Noctule | Borowiec wielki |
| common noun | rzeczownik pospolity |
| Common Object Request Broker Architecture | CORBA |
| Common Octopus | Ośmiornice |
| Common Pipistrelle | Karlik malutki |
| Common Public License | Common Public License |
| Common red soldier beetle | Zmięk żółty |
| Common Redshank | Krwawodziób |
| Common Rosefinch | Dziwonia |
| Common Sandpiper | Brodziec piskliwy |
| Common sawfish | Piła |
| Common Scrambling Algorithm | Common Scrambling Algorithm |
| common sense | zdrowy rozsądek |
| Common Shag | Kormoran czubaty |
| common shelduck | ohar |
| Common skate | Skadi |
| Common Slavic | prasłowiański |
| Common snakeneck turtle | Żółw wężoszyi |
| common soapwort | mydlnica lekarska |
| Common soft wheat | Pszenica zwyczajna |
| Common sole | Sola zwyczajna |
| Common Spadefoot | Grzebiuszka ziemna |
| Common Spotted Cuscus | Kuskus plamisty |
| common tariff policy | wspólna polityka celna |
| Common Teal | Cyraneczka |
| Common Tenrec | Tenrek zwyczajny |
| Common Treecreeper | Pełzacz leśny |
| Common Unix Printing System | Common UNIX Printing System |
| Common Vampire Bat | Wampir zwyczajny |
| common whitefish | sieja pospolita |
| Common Wombat | Wombat tasmański |
| Common wood pigeon | Gołąb grzywacz |
| common year | rok nieprzestępny |
| Common-pool resource | Dobra publiczne |
| commonly | codzienny |
| commonplace | pospolity |
| commonsense | zdroworozsądkowy |
| Commonwealth | Wspólnota Narodów |
| Commonwealth Games | Igrzyska Wspólnoty Narodów |
| Commonwealth Liberal Party | Związkowa Partia Liberalna |
| Commonwealth of Australia | Australia |
| Commonwealth of Dominica | Dominika |
| Commonwealth of Independent States | WNP |
| Commonwealth of Nations | Wspólnota Narodów |
| Commonwealth of the Bahamas | Bahamy |
| Commonwealth realm | Commonwealth realm |
| commotion | zamieszanie |
