| Ondes Martenot | Ondes Martenot |
| Ondol | Ondol |
| Ondárroa | Ondárroa |
| one | un |
| one after the other | successivement |
| one and a half | un et demi |
| one and only | unique |
| one and the other | l'un et l'autre |
| one another | l'un l'autre |
| One Canada Square | One Canada Square |
| one day | un jour |
| One Day in Your Life | One Day In Your Life |
| One half | Un demi |
| One Hour Photo | Photo Obsession |
| One Hundred Years of Solitude | Cent ans de solitude |
| One hundreth of a leu | Monnaie |
| One Laptop per Child | One Laptop per Child |
| One Missed Call | La Mort en ligne |
| one more | encore un |
| one or the other | l'un ou l'autre |
| One person show | One-man-show |
| One Piece | One Piece |
| One piece swimsuit | Maillot de bain une pièce |
| One Piece terms | Seigneur des pirates |
| One Power | Pouvoir Unique |
| One Ring | Anneau unique |
| One Thousand and One Nights | Les Mille et Une Nuits |
| one time | une fois |
| One Tree Hill | Les Frères Scott |
| One True Thing | Contre-jour |
| One Wild Oat | Une avoine sauvage |
| one-arm bandit | machine à sous |
| one-armed | à un seul bras |
| one-armed bandit | machine à sous |
| One-Day International | One-day International |
| one-eyed | borgne |
| One-Eyed Jacks | La Vengeance aux deux visages |
| One-form | Forme différentielle de degré un |
| one-night stand | amour de rencontre |
| One-parameter group | Sous-groupe à un paramètre |
| one-piece | d'une seule pièce |
| One-Pound Gospel | One-Pound Gospel |
| one-room apartment | studio |
| one-sided | partial |
| one-time | unique |
| One-time pad | Masque jetable |
| One-Two-GO Airlines | One-Two-Go Airlines |
| one-way | simple |
| One-way function | Fonction à sens unique |
| Onega | Onega |
| Onega River | Onega |
| Oneglia | Oneille |
| Oneida | Oneida |
| Oneida tribe | Onneiouts |
| Oneiroi | Oneiroi |
| Onela | Ali |
| Oneonta | Oneonta |
| onerous | pénible |
| Ones complement | Complément à un |
| oneself | soi-même |
| Onesicritus | Onésicrite |
| Onesti | Onesti |
| onetime | ancien |
| OneTouch Premier League | Championnat du Ghana de football |
| Oneway | Circulation en sens unique |
| Oneworld | Oneworld |
