D
- Darex
- Darn Tough
- Datrex
- Davis Instruments
- DeadLead
- Delco-Remy
- Delta Tackle
- Demco
- Den Haan
- Dependable Machine Works
- Dexter / Russell
- Dexter Axle
- Dick Nite Spoons
- Dickinson Marine
- Dicor
- Discovery Bay Marine Gear
- Dixon Valve & Coupling
- Do-Gree Fashion USA
- Do-It
- Dock Edge
- Dometic
- Dorcy
- Double D Knitting & Glove
- Douglas Cross Enterprises
- Dr. LED
- Dr. Shrink
- Draw-Tite
- Dri-Dek
- Dri-Z-Air
- Duck
- Duramax Marine
- Dutch Harbor Gear
- Dutton-Lainson Company
- Dynabrade
- Dyno Battery
- Dryshod