- Online Shopping India
- OshKosh B'gosh
- Overall Warehouse
- Orion Telescopes
- Overstock Drugstore
- Old Time Candy
- Office Supply
- Oompa Toys
- OtterBox
- OutletPC.com
- Orbitz
- Origins
- Outdoorplay
- OPSGEAR
- Orange Onions
- Onward Reserve
- OpenTip
- Outdoor DIVAS
- O'Reilly Auto Parts
- Orvis
- Overland
- Oreck
- Oddball Big Shoes
- OZone Billiards
- Oakley Signs & Graphics
- Old Spice
- Orient Watch USA
- Overstock
- Oneida
- Oakley
- Oktoberfest Haus
- Orbitnutrition.com
- One Kings Lane
- OfficeFurniture.com Inc.
- Our 365
- Our Designs
- Omaha Steaks
- Onecall
- OnGossamer
- Old Navy Canada
- OpenSky
- Office Designs
- OuterInner
- OnePiece
- OC Inkjet
- Overtons
- OnlineShoes
- Od International
- Olive Nation
- Olympus
- Old Navy
- O'Reilly
- Ottlite
- Oliviers & Co.
- OnlineCarStereo
- Onesuite
- Olive Juice
- Olacabs.com
- Online Sports
- OBEY Clothing
- Overload
- Oregon Scientific
- Opening Ceremony
- Oriental Trading Company
- Orchard Supply Hardware
- OutdoorCooking.com
- Otto Frei
- Ozgameshop
- Oprah.com
- Obedding
- OLEHENRIKSEN
- OTTE
- Organize
- Overstock Silver
- Outdoor Rugs Only
- Oh! Nuts
- Olivegreendog
- Our Campus Market
- Originalretrobrand
- Officer store