- O.C.P.
- O.S.I
- Oasis
- Obione
- océopin
- Oclam
- Distribuzione OCP
- Odass Paris
- ODOST
- Odysud
- Oenobiol
- Officina Urban Therapy
- OGUST - SAS PAPPA
- OLBO
- Olfa | Santé
- Oligo Santé
- Olisma
- OLLA
- Omega Pharma France
- Omron Healthcare France
- Omron Santé France
- Onagrine
- Oniris SAS
- = Opelle SAS
- Opella Healthcare France SAS
- Ophrys Medical
- Ophtalmic B&T
- OptimaBio
- Optimhal-Protecsom
- ottimiz
- OrdOkiddy
- Organys SAS
- Italia || 334
- Orion Corporation
- Orkyn
- Orliman Europe
- Ormendes SA
- Ornis - Ecuphar
- Orthonov
- Orthosoft
- Ortis
- Osalia
- OSato Europe
- Oscare
- Oscience
- Osilab || Concetto
- OTC Concept
- OTC Medical
- OWS Medical Diffusion
- Outremer
- Owen Mumford
- Oxypharm
- OysterShell
- OZALYS || 402
