- Daburn Electronics & Cable Corp.
- Daden-Anthony Associates, Inc.
- Daico Industries
- Dale
- Dallas Semiconductor
- Danam Communications, Inc.
- Data Delay Devices
- Davicom Semiconductor
- DDK Electronics, Inc.
- Defond Manufacturing Ltd.
- DEL Electronics Corp.
- Delevan
- Delta Electronics
- Delta Microwave
- Dense-Pac Microsystems
- Densitron International PLC
- Deo Comtech Pvt Ltd.
- Dialight
- DiCon Fiberoptics, Inc.
- Dielectric Laboratories
- Digital Equipment Corp.
- Digital Power Corp.
- Diodes, Inc.
- Diversitronix Wireless
- DonTronics
- DNA Group, Inc.
- DPA Solutions
- DSP Communications, Inc.
- DSP Group
- Duracell Batteries
