- Objet retrouve
- OBJECTS by
- Oclio
- Odlo
- Office DEPOT
- Okaidi et Obaibi
- Olinty
- Oliviers-Co
- Olivier Desforges
- One
- Onedirect
- ONE Emballages
- O Neill
- One Stop Plus
- OnlineBingo
- Optical-center
- Opticien24
- Oopad
- Ooxoo
- OpticalGroup
- OptimalPrint
- Optistore
- Orange
- Orange Fleet Performance
- Orange mobile
- Orcanta
- Oreca
- Orgone Design
- Oregon Scientific
- Oscaro
- OTELO
- Otopix
- Ouah
- Outiror
- Ouverture Boutique Simply Life Shop
- Oxbow
- Oxyd