- obedient, Old Fr. obedient
- obeisance, Old Fr. obeissance, compare Mod. Fr. obéissance
- obelisk, Middle Fr. obélisque
- obesity
- obey
- objection
- objet d'art
- oblation
- obligation
- oblige, Old Fr. obligier, compare Mod. Fr. obliger
- oblique
- obliquity
- obscene
- obscure
- obscurity
- observance
- observant
- observatory
- observe
- obstacle
- obtain
- obtuse
- occasion
- occident
- occidental
- occipital
- occupation, Old Fr. occupacion, compare Mod. Fr. occupation
- occupy
- occur
- occurrence
- ocean, Old. Fr. occean, compare Mod. Fr. océan
- Oceania, Fr. Océanie
- ocelot, Fr. ocelot, from Nahuatl ocelotl
- ochre
- octogenarian
- oculist
- odalisque
- ode
- odious, Anglo-Fr. odious, from Old Fr. odieus, compare Mod. Fr. odieux
- odometer, Fr. odomètre
- odour or odor, Anglo-Fr. odour, from Old Fr. odor, compare Mod. Fr. odeur
- oeillade
- oeuvre
- offend
- offense, Old Fr. offense
- offensive
- offer
- office
- officer, Old Fr. officier
- official
- officinal
- ogive, Fr. ogive
- ogre
- oil, Old Fr. oile, compare Mod. Fr. huile
- ointment, Old Fr. oignement
- oleaginous
- oligarchy
- olive
- Oliver
- omelette or omelet, Fr. omelette
- omission
- omnibus
- omnipotent
- onerous
- onion
- onyx
- ooh la la
- opacity
- opal
- opaque
- operation
- opine
- opinion, Old Fr. opinion
- opportune
- opportunism, Fr.opportunisme
- opportunity
- oppose, Old Fr. opposer
- opposite
- opposition, Old Fr. oposicion, compare Mod. Fr. opposition
- oppress, Old Fr. oppresser
- oppression
- opprobrious
- opt
- optative, Fr. optatif
- optic
- optician
- optimism, Fr. optimisme
- optimist
- option
- opulence
- oracle, Old Fr. oracle
- oracular
- orange, Old Fr. orenge, compare Mod. Fr. orange
- orator
- orb
- orchestration
- ordain, Old Fr. ordener, compare Mod. Fr. ordonner
- order, Old Fr. ordre
- ordinance
- ordinary
- ordination
- ordure
- organ
- organdy
- organic
- organisation
- organise
- organism
- orgasm
- orgy
- orient
- Oriental
- orientalism
- orientate
- orientation
- orifice
- oriflamme
- origin
- original
- originality
- orimulsion
- oriole, Fr. oriol, from Old Provençal auriol
- orison
- ormolu
- ornament
- ornithopter
- orogeny
- orpine
- orthogonal
- orthography, Old Fr. ortografie, compare Mod. Fr. orthographe
- orthopedic
- oscillation
- osier
- osprey
- ostensible
- ostentation
- ostrich
- Ottoman
- oubliette
- ounce
- oust
- ouster
- outrage
- outrageous
- outré
- overt
- overture
- ovule
- oxidant
- oxidation
- oxide
- oxygen
- oyer and terminer
- oyez
- oyster
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