Audio manufacturers
- Cosmotronic
- Cranborne Audio
- Crazy Tube Circuits
- cre8audio
- Crown
- Crumar
- Cuntz Guitars
- Cyclone Analogic
- cyma forma
- D&R
- D16 Group
- daCarbo
- Daddario
- Danelectro
- DAngelico
- Dangerous Music
- Dante
- DAP-Audio
- Darkglass
- DAS Audio
- Dateq
- Dato
- Dawner Prince
- dB Technologies
- DBX
- DDrum
- Dean Guitars
- Death by Audio
- Denise Audio
- Denon DJ
- Der Mann mit der Maschine
- Dexibell
- DGZ Dime Guitarz
- Dialtune
- Diamond
- Die Flüsterei
- Dieter Otto
- Diezel
- DiGiCo
- DiGiGrid
- Digital Sound
- Digitech
- Dillinger Labs
- Dingwall
- DirectOut
- Dixon
- DJ Techtools
- DJ.Studio
- DOCtron
- Doepfer
- DPA
- Dr.Suzuki
- Drawmer
- Dreadbox
- Dreamtonics
- DrumCraft
- Drumport StompTech
- DryBell
- DS Drum
- DSM & Humboldt
- Dtronics
- Dual
- Duesenberg
- Duke
- Dunlop
- DUY
- DV Mark
- DW
- Dynacord
- Dynaudio
- EarthQuaker Devices
- Earthworks Audio
- Eastman
- EastWest
- EBow
- EBS
- Echo Fix
- Ecler
- Edgar Russ - Sound of Cremona
- Edwards
- Efnote
- Ehrlund Microphones
- Eich Amplification
- Ekustik
- Elation
- Electro Harmonix
- Elektron
- Elgato
- Elite Acoustics
- Elysia
- Embodme
- Emeo
- Emma
- Empirical Labs
- Empress Effects
- Endorphin.es
- Engine Audio
- Engl
- Entropy & Sons
- Epiphone