- Hamamatsu
- Hammond Manufacturing
- Hangzhou Sail Electronics Co., Ltd.
- Hantronix, Inc.
- Harris Semiconductor
- Harwin
- Hathaway Corporation
- HCD Research
- Hengstler-Kaco
- Hennessy Products
- Herga Electric Limited
- Herotek
- Hertz Technology
- Hewlett-Packard
- Heyco Products, Inc.
- H.H. Smith
- High Frequency Crystals Ltd.
- Highly Electric Co., Inc.
- Hill Engineering
- Hirose Electric
- Hitachi Semiconductor
- Hittite Microwave
- Hobart Electronics
- Hoffman Engineering
- Hollingsworth
- Holtek
- Honeywell
- Honeywell Solid State Electronics
- Hubbell Premise Wiring
- Huber+Suhner
- Hunter Technology Corp.
- Hutson Industries
- HV Component Associates
- Hybricon Corp.
- HyComp
- Hypertronics
- Hy-Q International
- Hyundai
