- DOSKO
- Dosmatic
- DOSMONO
- DOSPEL
- Doss
- Dossena
- Dostmann
- Dostmann Electronic
- Dosy
- DOT
- Dot Hill
- Dot Hill Systems
- Dot Origin
- Dot-Spot
- Dot-x
- Dotcell
- Dotco
- DOTECH
- Dotel
- DOTEX
- DOTLUX
- Dotronix
- Dotworkz
- DOUBLE E
- Double Horse
- Double Horse Toys Industry
- Double Intelligence Technology
- Double K Industries
- Double Power Technology
- DOUBLEEAGLE
- DoubleLock
- DoubleSight
- DoubleSight Displays
- Doufit
- Doug Fleenor Design
- DOUG S HEADERS
- Doug Thorley Headers
- Dough Pro/Pro-Process
- dough Xpress
- Doughboy
- Doughpro
- Doughty
- Doughty Engineering
- DOUGHXPRESS
- Douglas
- Douglas Battery
- Douglas Dynamics
- Douglas Lighting Controls
- DOUGLAS MACHINES CORP.