- D270S
- D2713
- D3116 Hard Disk Unit
- D3126 Hard Disk Unit
- D3126H Hard Disk Unit
- D3146H Hard Disk Unit
- D4 LLC
- D41S
- D42S
- D42S 3.0
- D5126 Hard Disk Unit
- D5126H Hard Disk Unit
- D5146 Hard Disk Unit
- D5146H Hard Disk Unit
- D51S
- D52S
- D52S 3.0
- D5655 Hard Disk Unit
- Dabbala (Rej) Rajagopal Reddy
- Dabbler
- DacEasy
- Daegis Inc
- DAEMON Tools Lite
- DAEMON Tools Net
- DAEMON Tools Pro
- DAEMON Tools Pro Advanced
- DAEMON Tools Pro Standard
- Daewoo CPC-50 (Zemmix)
- Daewoo CPC-50A
- Daewoo CPC-50B
- Daewoo CPC-51
- Daewoo CPC-61
- Daewoo CPG-120
- Daewoo DTX-1493FW
- Daewoo International
- Daewoo TV-Sports 77
- DAFCA
- Dainippon Screen Manufacturing
- Daintree Networks
- Dairy.com
- Daishin Information & Communication
- Daisy Systems Corporation
- Dakota Software
- Dakshi Agrawal
- Dale E. Turner
- Damballa
- Damco Solutions Inc
- DameWare
- Damovo
- Dan Bricklin's Website
- Dan Fylstra
- Dan Magenheimer
- Dan Millman
- Dan Warmenhoven
- Dan's Antique Computer Collection
- Dana L. Ulery
- Dana Stewart Scott
- Dancing Dots
- Dane-Elec Memory
- Danese Cooper
- Danga Interactive
- Daniel (Danny) Mark Lewin
- Daniel A. Hitchcock
- Daniel Broido
- Daniel C. Edelstein
- Daniel C. Lynch
- Daniel D. McCracken
- Daniel E. Cooke
- Daniel Henry Holms Ingalls, Jr.
- Daniel J. Boorstin (American social historian and educator, 1914)
- Daniel Karrenberg
- Daniel Kottke
- Daniel L. Murphy
- Daniel Meyer
- Daniel Paul Siewiorek
- Daniel Quinn
- Daniel Singer Bricklin
- Daniel Teichroew
- Danlaw Technologies Ltd.
- Danny (Dan) Spracklen
- Danny Cohen
- Dantz Development
- Daon
- Daptiv
- Daring Development
- Dario de Judicibus
- Darleane C. Hoffman
- Darlene Solomon
- DARPA Director Arati Prabhakar in Conversation with John Markoff @CHM June 11, 2014
- Dartmouth Time Sharing System
- Darwin (operating system)
- Das RGB
- DASD MANAGER PLUS for DB2
- Dassault Systemes Abaqus
- Dassault Systèmes SolidWorks Corp
- Dassault Systems
- Data 100
- Data Design System
- Data Domain