Brands
- D*A*M
- Dallas
- Dallas Arbiter
- Dallas Music Industries Ltd.
- Dallas-Arbiter-England
- Damage Control (Strymon)
- Dan Armstrong
- Dan Armstrong (Musitronics)
- Dan Armstrong (Reissues)
- Danelectro
- Daniel Zink
- Daphon
- Daredevil Pedals
- Daring Audio
- Dean Markley
- DeArmond
- Death by Audio
- DeepTripLand
- DeltaLab
- Deltron UK
- Demeter
- Denis Cornell
- Dennis Cornell
- DenTone
- Departure Electronics
- Devi Ever
- Dharma Sound
- Diabolical Amplification
- Diabolical Amplification-Class A Electronics
- Diamond
- DiceWorks
- Diederich Electronics
- DigiPlay
- DigiTech
- Digitech X-Series
- Dinosaural
- Dirt Garden Effects
- Dirty Bird Audio
- Dirty Devil
- Divided By Thirteen
- DLS Effects
- DMB
- DNA Analogic
- DOD
- DOD (Reissues)
- Doepfer
- Don Butler
- Dr Boogie
- Dr. Scientist
- Dragonfly
- DryBell
- Dubtronics
- Dunlop
- Dunlop (MXR)
- Dunlop (MXR) Reissues
- Dunlop (Way Huge) Reissues
- Durham Electronics
- DW Labs
- Dwarfcraft Devices
- Dynacord