- Harrington Corporation
- Harrington Hoists
- Harris
- Harris Corporation RF Communications Division
- Harsper
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- Hartan
- Hartell
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- Hartig Helling
- Hartig+Helling
- Harting
- Hartke
- Hartmann
- HARVARD
- Harvard Apparatus
- HARVEST
- Harvest One
- Harvest Right
- Harvest TEC
- HARVEY
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- Harvil
- Harwa
- Harwil Precision Products
- Hasbro
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- Hasbro Games
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- Hasco
- HASE
- HASE Bikes
- Hasee
- Haskel
- Hasler
- Haspo
- Hasselblad
- HASSNET
- Hastings
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- Hatco