O
- Old Navy
- One Hanes Place
- Origins
- Omaha Steaks
- Origins UK
- Omio
- Oasis UK
- Oral-B
- Orvis
- On The Beach
- Orvis UK
- Old Navy Canada
- OnBuy
- Office Shoes
- Overclockers
- Otrium
- Opodo
- Original Penguin
- OTTY
- Overtons
- Oak Furniture Superstore
- Oxygen
- Oroton
- OKA
- One World Observatory
- Outdoor Look
- OnePiece
- OnePiece UK
- Ole Henriksen
- Oneplus
- Ordnance Survey
- OshKosh B'gosh
- OneTravel
- Organifi
- OTAA
- Overnight Glasses
- Online Fabric Store
- Overnight Prints
- Oak Furniture House
- OGL