Audio manufacturers
- Harrison Audio
- Hartke
- Haun
- Hazelrigg Industries
- Headliner
- Headrush
- hearos
- Hearsafe
- HEDD
- Heil Sound
- Hemingway
- Hercules
- Hercules Stands
- Heritage Audio
- Heritage Guitar
- HESU
- Hexinverter Électronique
- Hils
- Hinkler Books
- Hit'n'Mix
- HK Audio
- HOFA
- Höfner
- Hollyland
- Honz Technologies
- Horch Audiogeräte
- Hörluchs
- Hornberg Research
- Hosa
- Hotone
- Hughes & Kettner
- Human Base
- Ibanez
- Icon
- iConnectivity
- ifi Audio
- IGS Audio
- IK Multimedia
- IM Mutes
- Image-Line
- Imaginando
- IMG Stageline
- Industrial Music Electronics
- InEar
- Initial Audio
- Instamic
- Instruo
- InstruVents Brass
- Intech Studio
- Intellijel Designs
- Intricon
- Intuitive Instruments
- IrcamLAB
- iriz
- Isovox
- ISP Technologies
- iZotope
- J. Rockett Audio Designs
- Jackson
- Jackson Audio
- JAM pedals
- James Neligan
- JBL
- JHS Pedals
- Jico
- Johannes Scherzer
- Johannes Seiler
- Johannus
- Johannus Premium
- Jomox
- Joranalogue Audio Design
- Josef Lidl
- Journey Instruments
- Joyo
- JTS
- Juan Hernandez
- Jupiter
- JVC
- K&M
- Kai
- Kala
- Kala Makala
- Kali Audio
- Kamaka
- Karanyi Sounds
- Karl Höfner
- Kasleder
- Kaufmann
- Kawai
- Keeley
- Keilwerth
- Kemper
- Kenton
- Kernom
- Ketron
- King
- Kit Plugins
- Klark Teknik
- Klaus Heffler
- Klavis