- Horizont
- Horizont Agrar
- Hormann
- Hörmann Ecostar
- Hörmann KG Antriebstechnik
- Horn
- Hornady
- Hornbach
- hornbill
- Hornby
- Hornby Hobbies
- HORNER
- Horner APG
- Horner Automation
- Hornet
- Hornet Car Security
- HornetTek
- Horng Technical Enterprise
- horntools
- Horreds
- horsch
- Horst
- Horstmann
- Hortus
- Horus
- HOS247
- Hosa Technology
- Hosdecora
- Hoselink
- Hoseo Telnet
- Hoshizaki
- Hoshizaki America
- Hoshizaki American, Inc.
- Hosiden
- HOSPECO
- Hospira
- Host
- Hostess
- Hot Box
- Hot Grips
- Hot Shot
- Hot Spot