- Novamatic
- Novation
- Novelan
- Novero
- NOVY
- Nuance
- NuForce
- NuTone
- NutriBullet
- Nvidia
- OBJECTIF LUNE
- Oceanic
- OFM
- OJ Electronics
- OK
- OKI
- Olivetti
- Olympia
- Olympus
- Omega
- Omenex
- Omron
- Omron Healthcare
- One For All
- ONEFORALL
- OnePlus
- ONKYO
- ooma
- Opel
- OPEN OFFICE
- Oppo
- Optex
- Optimus
- Optoma
- ORANGE
- ORAY
- Oregon
- Oregon Scientific
- Orion