Audio manufacturers
- Romero Creations
- Ron Vaughn
- Rosendahl
- Rotosound
- Royer Labs
- Rtom
- RTW
- Rudolf Meinl
- Rumberger
- Rupert Neve Designs
- RZ Clarinets
- RZmagoo Clarinets
- S.E. Shires
- Sabian
- Sadowsky
- Safari Audio
- Sandberg
- SanDisk
- Sandner
- Sanken
- Sankyo
- sbip
- Scala Vilagio
- Schagerl
- Schagerl Drums
- Schecter
- Schertler
- Schilke
- Schimmel
- Schlagwerk
- Schlappi Engineering
- Schoeps
- Schreiber
- Schucht Sax Technology
- SD Systems
- SE Electronics
- Seagate
- Seagull
- Seeburg Acoustic Line
- Seiler
- Selmer
- Sennheiser
- Sennheiser-Hearing
- Sequential
- Serato
- Sessiondesk
- Seymour Duncan
- Shadow
- Shakmat Modular
- Shapingwaves
- Sheeran Loopers
- Sherman
- Showtec
- Shure
- Sierman
- Silverstein
- Sim'n Tonic
- Singular Sound
- Sinusoda
- Sirus
- Slate Digital
- Slingerland
- Smith-Watkins
- Softube
- Solar Guitars
- Soldano
- Solid Gold FX
- Solomon
- SOMA
- Sonarworks
- Sonible
- Sonic Farm
- Sonicware
- Sonifex
- Sonnox
- Sonor
- Sonosax
- Sontronics
- Sonuscore
- Sony
- Sound Devices
- Sound Radix
- Sound Tools
- Soundboks
- Soundcraft
- Soundman
- Soundtoys
- Source Audio
- Sovtek
- Soyuz
- Spector
- Spitfire Audio
- SPL
- Spottune
- Squarp Instruments
- Squier
- SSL
- Staccato AI
- Stageworx
- Stanford