obéir  to obey

obliger  to force/obligate

obséder  to obsess

observer  to observe

obtenir  to obtain

offrir  to offer/give

omettre  to omit/leave out

opérer  to operate

opposer  to oppose

ordonner  to order

organiser  (to organize/arrange)

oser  (to dare)

oublier  (to forget)

ouvrir  (to open)