U
- U&I Software
- U-He
- U-sound
- U-TRONICS
- U.S. Masters
- UB+
- Ubisoft
- Ucapps
- UDG
- UDO Audio
- Ueberschall
- UFIP
- UFO Scientific
- UGO Audio
- Ugritone
- Uher
- UHL Instruments
- Ujam
- UK Electronic
- UK Music Apps
- UK Sound
- Uk-music
- Ultimate
- Ultimate Attenuator
- Ultimate Ears
- Ultimate MIDI Plugin
- Ultimate Patches
- Ultimate Percussion
- Ultimate Support
- Ultimate Touch Control
- Ultra
- UltraFunk
- Ultralite
- UltraMixer
- Ultrano's Software
- Ultrasone
- Ultrasound Amplifiers
- Ultrawave Audio
- umidi
- Umlaut Audio
- Undead Instruments
- Undertone Audio
- UnderToneAudio
- Undrgrnd Sounds
- Unfiltered Audio
- Unicase
- Unified Guitar Works
- Unika
- Union Audio
- Union Tube & Transistor
- Unison Audio
- Unit Audio
- United Plugins
- United Studio Technologies
- unItOne
- UnitOvOne
- Unity Audio
- Univers Labs
- Universal Acoustics
- Universal Audio
- Universal Piper
- Universal-Effects
- University of Iowa
- Universumkiosk
- Univox
- Unknown Devices
- Unorthodox Audio
- UnplugRed
- Unreal Voodoo
- Unterlass
- UplandToys
- Uppercussion
- Upscale Technology
- Upton Microphones
- Urban Factory
- Urbanears
- Urei / Jbl
- Urei Dj
- Uri Nachmias
- URS
- Ursa Major
- US BLASTER
- USA Custom Guitars
- USAudio
- Use Audio Inc.
- Useful Arts
- UTC
- Utopian Dreams Band
- UVI
- UWYN