| orphan | Findelkind |
| orphan boy | Waisenknabe |
| orphan boys | Waisenjungen |
| orphan child | Waisenkind |
| orphan children | Waisenkinder |
| orphan disease | seltene Erkrankung |
| Orphan drug | Orphan-Arzneimittel |
| orphan drugs | Arzneimittel für seltene Leiden |
| orphan girl | Waisenmädchen |
| orphan girls | Waisenmädchen |
| orphan line | Schusterjunge |
| Orphan of Creation | Waisen der Schöpfung |
| orphan receptor | Waisen-Rezeptor |
| Orphan works | Verwaistes Werk |
| orphan's court | Nachlassgericht |
| orphan's social benefit | Waisenrente |
| orphanage | Waisenhaus |
| orphaned | verwaist |
| orphaned puppies | verwaiste Welpen |
| orphanhood | Waisentum |
| orphanry | Waisenhaus |
| orphans | Waisenkinder |
| Orphans of the Sky | Universum |
| Orphans of the Storm | Zwei Waisen im Sturm |
| orphans' pension | Waisengeld |
| Orpharion | Orpheoreon |
| Orphean Warbler | Orpheusgrasmücke |
| Orpheus | Orpheus |
| Orpheus in the Underworld | Orpheus in der Unterwelt |
| Orpheus With Clay Feet | Orpheus mit Pferdefuss |
| Orphic | Geheimnissvoll |
| Orphism | Orphiker |
| orphite | Orphit |
| orpiment | Auripigment |
| orpiment yellow | Auripigment |
| Orpington | Orpington |
| Orpund | Orpund |
| orreries | Planetenmodelle |
| orrery | Planetenmodell |
| orris | Florentiner Schwertlilie |
| orris oil | Irisöl |
| orris root oil | Iriswurzelöl |
| Orrorin tugenensis | Orrorin tugenensis |
| orrugated cardboard factory | Wellpappenfabrik |
| Orsa Municipality | Orsa |
| Orsanmichele | Orsanmichele |
| Orsay | Orsay |
| Orseis | Orseis |
| Orselina | Orselina TI |
| Orsha | Orscha |
| Orsingen-Nenzingen | Orsingen-Nenzingen |
| Orsini | Orsini |
| Orsini family | Orsini |
| Orsinian Tales | Geschichten aus Orsinien. Science Fiction Erzählungen aus einem erfundenen Land |
| Orsières | Orsières VS |
| Orsk | Orsk |
| Orso Ipato | Orso Ipato |
| Orson Scott Card | Orson Scott Card |
| Orson Welles | Orson Welles |
| Ort | Ort |
| Ortaköy Mosque | Ortaköy-Moschee |
| Ortega hypothesis | Ortega-Hypothese |
| Orteig Prize | Orteig-Preis |
| Ortelius oval projection | Agnese-Ortelius-Projektion |
| Ortenaukreis | Ortenaukreis |
| Ortenberg | Ortenberg |
| Ortenburg | Ortenburg |
| ortetamine | Ortetamin |
| Orth an der Donau | Orth an der Donau |
| Orth. : Orthodox | orth. : orthodox |
| orthclase | Orthoklas |
| Orthez | Orthez |
| orthite | Orthit |
| ortho-coumaric acid | o-Cumarsäure |
| orthoamphibole | Orthoamphibol |
| orthobunyavirus | Orthobunya-Virus |
| orthobunyaviruses | Orthobunya-Viren |
| orthochorea | Chorea bei aufrechter Körperhaltung |
| orthochromatic | farbecht |
| orthochromatical | tonwertrichtig |
| orthochrysotile | Orthochrysotil |
| orthoclase | Mondstein |
