Manufacturers:
- Daetron
- Daewoo
- Daiwa Industry Co.
- Dalian Levear Electric Co Ltd
- Dana Laboratories Incorporated
- Data East
- Data Precision
- Datron Instruments
- dbx
- Degen
- Dell
- DeLonghi
- Delta
- Delta Elektronika BV
- Denon
- Dentron
- Dick Smith
- Digitech Studio
- Dirt Devil
- Dixie Narco
- Dolby
- Dolch Logic Instruments
- Dr. K. Witmer Elektronik AG
- Drake
- Dranetz Engineering Laboratories Inc.
- Dual
- Dumont Oscilloscope Laboratories Inc.
- Dymar Electronics Limited
