| obligatoirement | inevitably |
| obligeance | complaisance |
| obligeant | attentive |
| obliger | bind |
| obliger quelqu'un à tenir sa promesse | pin somebody down to a promise |
| obliger à | nail down to |
| obligé | peremptory |
| oblique | skew |
| obliquement | slantwise |
| oblitération | cancellation |
| Oblomov | Oblomov |
| oblong | elongated |
| Oblys de Djamboul | Zhambyl Province |
| Oblys de Jambyl | Zhambyl Province |
| Oblys de Karaganda | Karagandy Province |
| Oblys de Kyzylorda | Kyzylorda Province |
| Oblys de Mangghystau | Mangystau Province |
| Oblys de Manguistaou | Mangystau Province |
| Oblys de Pavlodar | Pavlodar Province |
| Oblys de Qaraghandy | Karagandy Province |
| Oblys de Qostanay | Qostanay Province |
| Oblys de Qyzylorda | Kyzylorda Province |
| Oblys du Kazakhstan méridional | South Kazakhstan Province |
| Obninsk | Obninsk |
| Obnubilation | Obnubilation |
| Obor | Obor metro station |
| Oborniki Śląskie | Oborniki Śląskie |
| Obornjača | Obornjača |
| Obourg | Obourg |
| Obra | Obra River |
| Obras Sanitarias de Buenos Aires | Obras Sanitarias |
| Obrenovac | Obrenovac |
| Obrenović | House of Obrenović |
| Obrež | Obrež |
| Obrovac | Obrovac |
| obscur | dim |
| obscurantisme | obscurantism |
| obscurantiste | obscurantist |
| obscurcir | complicate |
| obscure | dark |
| Obscurite | Eclipse |
| obscurité | ambiguity |
| obscurément | dimly |
| obscène | nasty |
