- Offworld Percussion
- OurSong Studios
- Outdoor Pizza Ovens
- Operational Studies Group
- Outset Media
- Our Heiday
- Organature
- Ooooby
- Omega Yeast
- Oliver Thom
- Ocean City Coffee
- Ozeki Sake
- Outside.com
- Old Spirits Company
- Ocean Vodka
- Oakville Grocery
- Olvera Music
- OvaEasy Egg Crystals
- Occam
- OneSource Bathrooms
- Organic Way
- Orchard Street
- Orange22Modern
- Oh Comadre Candles
- Oliver Henry Candle
- Oban Whisky
- Organic Maids
- Outlook Baby
- Oak and Bond Coffee
- Opus Coffee
- One Great Cup
- Organic Herbie
- Orange Glad
- Oliver & Adelaide
- Our First Year
- Order Ultra
- Out-U-Go
- ODii
- Old Willy's Forum
- OA Foods
- OtakuFest
- On Gossamer Wings
- Omnivore
- Opera Foods
- Outdoor Power
- Outside the Box Papers
- Onlinepartycenter
- Osma
- Orenda
- Oyama
- OmniBlend Australia
- Only An Ocean
- OJ Designs
- Ore International
- Olde Thompson
- O'Neill Skip Hire
- Outlaw Leather
- Outlaw Garden
- Organic Plant Magic
- Outdoor Power Sales
- Ovando
- OZEPOD
- On-Stage Stands
- Ortofon
- Outdoor Ukulele
- Organic Fabric Company
- Orapup
- Ocean Nutrition
- Online Nature Mall
- Osumex
- Omega Pet
- Old Town Aquarium
- Oowee Products
- Odec
- Olszlewski
- Of Aspen
- Oriental Treasures
- Onmier
- ORACLE OIL
- Olive Pit Stop