- Ozone Generator
- Orbit Gum
- Our Earth Straws
- Otrio Stationery & Gifts
- Orin Swift
- Onion
- Ortho
- Oye Happy
- Old West Iron
- O-Cedar
- Octane MotorSports
- OMO
- Otter Wax
- Osaka
- OSH Park
- Organic Baby Food Shop
- Old World Spices
- OddBird
- Outdoor Living
- Olababy
- Oak Bottle
- Onda
- Oregon
- Oscar & Hooch
- Only Vet Meds
- Oh You're Lovely
- Ovation Guitars
- Old Maps
- OmieLife
- Ototo
- OverTheRainbow
- Oliveri
- Odor Klenz
- Old California Lighting
- Osram
- One Stop Outdoor
- On The Run Meals
- OrderIn
- Okra and Molly
- Open Road Brands
- OdorStop
- Old Forester
- Onesies Downunder
- Oh Baby Boxes
- Outdoor Living Hot Tubs
- OHi Food Co
- One Fur All
- OnStage
- Old Postcards
- Oasis Snacks
- One Chew Three
- ORR Safety
- Orville Redenbacher's
- Oxbow
- Otamot Foods
- Once Again
- Oscar Mayer
- Oikos
- O'verlays
- Odie Pet Insurance
- Olliix Designs
- Organic Cotton Mart
- Oregon Patch Works
- Oldride
- O'Gormans
- Oaxis
- Oh My Cat
- OnItsArse
- One Degree Organic Food
- OnlyGold
- OhmniLabs
- Optimal Selection
- Oomph
- Office Star Products
- OFM
- Olympic Paints & Stains
- Omoi Zakka Shop
- Old Holland
- Opolo
- Obvious Wines