D
- D. G. Yuengling & Son – David, Jr. and David G. Jüngling (anglicized surname)
- d’Antin MotoGP – see Pramac d'Antin
- Daimler-Benz (later DaimlerChrysler, now Daimler AG) – Gottlieb Daimler and Karl Benz
- Dallara – Gian Paolo Dallara
- Damiani – Enrico Grassi Damiani
- Danelectro – Nathan Daniel
- Dangote Group - Aliko Dangote
- Dargaud – Georges Dargaud
- Dassault Group – Marcel Dassault
- Datsun – Kenjiro Den, Rokuro Aoyama, and Meitaro Takeuchi
- Dauer Sportwagen – Jochen Dauer
- David Jones Limited - David Jones
- David Lloyd Leisure – David Lloyd
- David Price Racing – David Price
- DBZ Guitars – Dean B. Zelinsky
- De Agostini – Giovanni De Agostini
- Dean & DeLuca – Joel Dean and Giorgio DeLuca
- Dean Guitars – Dean Zelinsky
- Debian – IAN Murdock and his girlfriend, DEBra.
- Deere & Company – John Deere
- Dell – Michael Dell
- Deloitte – William Welch Deloitte
- DeLorean Motor Company – John DeLorean
- De Tomaso – Alejandro de Tomaso
- DHL Express – Adrian Dalsey, Larry Hillblom, and Robert Lynn
- Dick Johnson Racing – Dick Johnson
- Dick's Sporting Goods – Dick Stack
- Dillard's – William T. Dillard
- Dolby Laboratories – Ray Dolby
- Dolce & Gabbana – Domenico Dolce and Stefano Gabbana
- Don Bluth Entertainment – see Sullivan Bluth Studios
- Douglas Aircraft Company (to McDonnell Douglas) – Donald Wills Douglas, Sr.
- The Dow Chemical Company – Herbert Dow
- Dow Jones & Company – Charles Dow and Edward Jones
- Ducati – Antonio Cavalieri Ducati
- Duesenberg – Fred and August Duesenberg
- Duke Energy – James Buchanan Duke
- Duke Video – Peter Duke
- Dunlop – John Boyd Dunlop
- Dunlop Manufacturing – Jim Dunlop
- DuPont – Eleuthère Irénée du Pont
- Dyson – James Dyson
Read more about this topic: List Of Companies Named After People