Supraphon
- A Czech company devoted to spread music of the genre by local artists. Features a catalogue composed by new recordings as well as digitally remastered re-editions of historic recordings.
- http://www.supraphon.com/

Sony Classical
- Classical, crossover, and soundtrack music label. Features sound clips, tour schedules, and upcoming releases.
- http://www.sonybmgmasterworks.com/

Sanctuary Classics
- Specializing in contemporary Classical music.
- http://www.sanctuaryclassics.com/homepage.php?section=0&subsection=0&gotFlash6=true

Sound Dynamics Associates
- Recording and reissuing Classical music performances and recordings on CD.
- http://sd-associates.com/

Sotone
- Releases of French Horn performances.
- http://www.sotone.com

Sherman Records
- Audio and video content licensing including Libretto Classics series.
- http://www.shermanrecords.com/

Somm Recordings
- Choral and instrumental music. Recordings of British conductor Sir Thomas Beecham. Online catalogue with MP3 samples.
- http://www.somm-recordings.demon.co.uk

Symposium Records
- Re-issues recordings from the late 19th & early 20th centuries.
- http://www.symposiumrecords.co.uk

Stieglitz
- (Classical Label of Pink Tontraeger) Rarities; online shopping. [German/English]
- http://www.stieglitz-klassik-musik-label.de

Sonora Productions
- Specializes in Classical and Sacred music.
- http://www.sonoraproductions.com/index.html

Stradivarius
- Independent Italian label devoted to presenting new and alternative classic music.
- http://www.stradivarius.it/