- Harco-The Harrington Corporation
- Hard Head
- Hardcast
- Hardi
- HARDIN MARINE
- Hardinge
- Hardware House
- HARDWARE RESOURCES
- Hardwood Reflections
- Hardy
- Hardy Barth
- HARGASSNER
- Hargray
- Hario
- Hario Glass
- Hark
- Harken
- Harley Benton
- HARLEY-DAVIDSON
- Harman
- Harman Automotive Electronic Systems (Suzhou)
- Harman Becker Automotive Systems
- Harman Consumer
- Harman International Industries
- Harman Kardon
- Harman Stove Company
- Harman-Kardon
- Harman/Kardon
- Harmann
- HARMAR
- Harmar Mobility
- Harmonic
- Harmonix Music Systems
- Harmony
- harnisch+rieth
- Harold Beck & Sons
- Harper
- Harper & Bright Designs
- Harper Lane
- Harper&Bright Designs
- Harrie Leenders
- Harrington