| oil-return pump | Ölrückförderpumpe |
| oil-ring bearing | Ölringlager |
| oil-seal ring | Simmerring |
| oil-shot lubrication | Eindruckschmierung |
| Oil-slick | Ölpest |
| oil-soaked filter material | ölbenetzte Filterfüllung |
| oil-soluble | öllöslich |
| oil-spill containment barrier | Ölsperre |
| oil-stain | Ölfleck |
| oil-stains | Ölflecken |
| oil-tempered | ölgehärtet |
| oil-tight | öldicht |
| oil-vapor baffle | Öldampfsperre |
| oil-vapour baffle | Öldampfsperre |
| oil-well bore | Bohrloch |
| oil-well borehole | Bohrloch |
| oil-well derrick | Bohrturm |
| oil-well drilling | Erdölbohrung |
| oil-well pump | Erdölpumpe |
| oilbased clay | Plastilin |
| oilbird | Fettschwalm |
| oilbirds | Fettschwalme |
| oilcake | Ölkuchen |
| oilcan | Öler |
| oilcans | Ölkannen |
| oilcloth | Wachstuch |
| Oildale | Oildale |
| oildrum | Ölfaß |
| oildrums | Ölfässer |
| oiled | eingeölt |
| oiled oneself | sich eingeölt |
| oiled paper | Ölpapier |
| oiled silk | Ölseide |
| oiled-paper capacitor | Ölpapierkondensator |
| oiler | Öler |
| oilers | Öler |
| oilfield | Ölfeld |
| oilfields | Ölfelder |
| oiliest | am öligsten |
| oilily | ölig |
| oiliness | Fettigkeit |
| oiling | Ölen |
| oiling oneself | sich einölend |
| oilless transformer | Trockentransformator |
| oilman | Ölhändler |
| oilostatic cable | Ölkabel |
| Oilpan | Gehäuse |
| oilpans | Ölschalen |
| oilproof | ölbeständig |
| oils | Erdölwerte |
| oilseed | Ölsamen |
| oilseed fuel | Ölsaatenkraftstoff |
| oilseed rape | Rübsamen |
| oilseeds | Ölsamen |
| oilshale | Ölschiefer |
| oilskin | Öljacke |
| oilskin jacket | Öljacke |
| oilskin raincoat | Regenhaut |
| oilskin suit | Öljacke |
| oilskins | Öljacke |
| oilstain | Ölfleck |
| oilstains | Ölflecken |
| oilstones | Abziehsteine |
| oiltight | öldicht |
| oilway | Ölleitung |
| oilways | Ölkanäle |
| oily | fett |
| Oily fish | Fettfische |
| oily hair | fettiges Haar |
| oily skin | fettige Haut |
| Oiniades | Iniades |
| oink | grunzen |
| oinments | Salben |
| Oinountas | Sellasia |
| Oinousses | Inousses |
| ointment | Balsam |
| ointment base | Salbengrundlage |
| ointment for burns | Brandsalbe |
| ointment jar | Salbendose |
| ointment-like faeces | salbenartiger Stuhl |
| ointment-like feces | salbenartiger Stuhl |
| ointments | Salben |
| Oio Region | Oio |
| Oirase River | Oirase |
| Oirats | Oiraten |
| Oireachtas | Irisches Parlament |
| Oisc of Kent | Oeric |
| Oise | Oise |
| Oise River | Oise |
| Oita | Oita |
| oiticica oil | Oiticica-Öl |
| OJ | OJ |
| Ojamajo Doremi | DoReMi |
| Ojibwa | Anishinabe |
| Ojibwe | Ojibwe |
| Ojos del Salado | Ojos del Salado |
| Ojus | Ojus |
| OK | einverstanden |
| OK : Oklahoma - Oklahoma City | Oklahoma |
| OK Budućnost Podgorica | OK Budućnost Podgorica |
| OK Go | OK Go |
| OK, OK! | jaja! |
| OK, that's fine. | Das hat geklappt. |
| Oka | Oka |
| Oka River | Oka |
| Oka's theorem | Satz von Oka |
| Okaloosa County | Okaloosa County |
| Okanagan Lake | Okanagan Lake |
| Okane ga nai | Okane ga nai |
| okapi | Okapi |
| Okapi Wildlife Reserve | Okapi-Nationalpark |
| okapis | Waldgiraffen |
| OKATO | OKATO |
| Okavango | Okawango |
| Okavango Delta | Okawango-Becken |
| Okavango Region | Kavango |
| Okavango River | Okawango |
| okay | einverstanden |
| okay sth. | etw. absegnen |
| Okayama | Okayama |
| Okayama Prefecture | Präfektur Okayama |
| okaying | genehmigend |
| okays | genehmigt |
| Okazaki fragment | Okazaki-Fragment |
| OKB | Experimental-Konstruktionsbüro |
| Okeanos | Okeanos |
| Okeechobee County | Okeechobee County |
| Okeh Records | Okeh Records |
| Okehampton | Okehampton |
| Okemos | Okemos |
| Okene | Okene |
| okenite | Okenit |
| Oker | Oker |
| Oker river | Oker |
| okey | einverstanden |
| okey dokey | habe verstanden |
| Okey! | Ist recht! |
| okey-doke, righto | das ist gebongt |
| okey-dokey | paletti |
| Okey-dokey! | Einverstanden! |
| OKFOL | OKFOL |
| OKG | Kernkraftwerk Oskarshamn |
| Okhotsk | Ochotsk |
| okhotskite | Okhotskit |
| Okhranka | Ochrana |
| Okhtyrka | Ochtyrka |
| Oki Islands | Oki-Inseln |
| Oki Province | Provinz Oki |
| Okie | Okie |
| Okies | Okies |
| Okinawa | Okinawa |
| Okinawa Churaumi Aquarium | Okinawa-Churaumi-Aquarium |
| Okinawa Island | Okinawa Hontō |
| Okinawa pine | Okinawa-Kiefer |
| Okinawa Prefecture | Präfektur Okinawa |
| okinawa rail | Okinawaralle |
| Okinawa Woodpecker | Okinawa-Specht |
| Okinawan language | Ryūkyūanische Sprache |
| okinawan woodpecker | Okinawaspecht |
| Okinotorishima | Okinotorishima |
| Okita Sōji | Okita Sōji |
