| Ostankinotornet | Ostankino Tower |
| Ostbahnhof | Berlin Ostbahnhof |
| ostburgare | cheeseburger |
| ostbåge | cheese curl |
| Ostende | Ostend |
| Ostendkompaniet | Ostend Company |
| ostentativ | ostentatious |
| ostentativt | ostentatiously |
| osteopat | osteopath |
| Osteoporos | Osteoporosis |
| Osterholz-Scharmbeck | Osterholz-Scharmbeck |
| osteriliserbar | unsterilizable |
| Ostermundigen | Ostermundigen |
| Osterøy kommun | Osterøy |
| Ostfalen | Eastphalia |
| Ostfildern | Ostfildern |
| Ostfluga | Cheese fly |
| Ostfriesland | East Frisia |
| osthyvel | cheese slicer |
| Ostia | Ostia |
| Ostindiefararen Götheborg | East Indiaman Götheborg |
| Ostindien | East Indies - the |
| Ostindiska kompaniet | East India Company |
| ostkaka | cheesecake |
| ostkrok | cheese puff |
| Ostland | Reichskommissariat Ostland |
| ostlig | eastward |
| ostlöpe | rennet |
| Ostmark | East German mark |
| ostmassa | curd |
| ostoppbar | uncontrollable |
| Ostpolitik | Ostpolitik |
| Ostpreussen | East Prussia |
| ostraffad | unpunished |
| Ostrava | Ostrava |
| Ostrogoter | Ostrogoths |
| Ostrogski | Ostrogski |
| ostron | oyster |
| ostronodling | oyster farming |
| Ostronsås | Oyster sauce |
| Ostrów Wielkopolski | Ostrów Wielkopolski |
| Ostrý Grúň | Ostrý Grúň |
| Ostseestadion | DKB-Arena |
| Ostsiedlung | Ostsiedlung |
| ostyrig | unwilling |
