- HALO Electronics
- Hama
- Hamamatsu Photonics
- Hamlin Electronics
- Hammond Manufacturing
- HANA Micron
- Hanbit Electronics
- Hangzhou Silan Microelectronics
- Hanna Instruments
- Hantronix
- Harris Corporation
- Harris Semiconductor
- Harting Technology Group
- Harvard Engineering
- Harvatek Corporation
- HARWiN
- Hasco Components International
- Hasco Relays and Electronics International
- HB Electronic Components
- HBH Microwave
- Heatron
- HEC
- Heimann Sensor
- Helicomm
- HELIEON
- Hellermann Tyton
- Hendon Semiconductors
- Hengstler
- Herga
- Hexawave
- HEXWAX
- Heyco Products
- HH Smith
- High Energy Devices
- High Voltage Power Solutions
- HiMARK Technology
- Himax Technologies
- Hind Rectifiers
- HIOKI Corporation
- HiRel Systems
- Hirschmann Automation & Control
- Hitachi Metals
- Hitachi Semiconductor
- Hitano Enterprise
- Hitec
- HiTRON Electronics Corporation
- Hittite Microwave
- HMC (Hualon Microelectronics Corporation)
- HN Electronic Components
- Hobbs Corporation
- Hoffman Enclosures
- Hokuriku Electric Industry
- Holsworthy Products
- Holt Integrated Circuits
- Holtek Semiconductor
- HolyStone International
- Honey Technology
- Honeywell Accelerometers
- Honeywell International
- Honeywell Sensing & Control
- Honeywell SSEC
- HONGFA
- Hope Microelectronics
- Hosa Technology
- Hosonic Electronic
- Houston Wire & Cable
- Hoyt Electrical Instrument Works
- HP (Hewlett-Packard)
- HRS (Hirose Electric)
- HS Marston Aerospace
- HSI (Hermetic Switch, Inc.)
- Hsin Da Precision
- HSMC (Hi-Sincerity Microelectronics Corporation)
- HTC Korea
- HTS
- Hubbell Wiring Device
- Hubbell Wiring Devices
- HUBER+SUHNER
- Humirel
- Hummel
- Huntington Electric
- Hurst
- HVCA (High Voltage Components Associates)
- HVVi Semiconductors
- HY ELECTRONIC
- Hy-Q International
- Hybrid Systems
- HYES Optoelectronics
- Hylec-APL
- Hynix Semiconductor
- Hytek Microsystems
- Hyundai Electronics
