O
- Online4baby
- Office Partner
- Orelia
- OPI
- onsport
- One.de
- Omoda
- Old Navy Canada
- Organifi
- Odlo
- Orvis
- Outdoor Look
- Outdoor Gear
- Oak Furniture Land
- Omio
- Olightstore
- outdoorsports24
- Oak Furniture Superstore
- Oasis
- OnePiece
- OKA
- Office Shoes
- Optimum Nutrition
- Opodo
- Outbacker Insurance
- Overtons
- Offspring
- Overnight Prints
- Oxygen
- OCTO Chocolate
- OLPRO
- Original Penguin
- Omaha Steaks
- OTTY
- OtterBox
- Only Kids Hangers
- Only Oak Furniture
- Onlynaturals
- Open for Vintage
- Origins