- Saariaho, Kaija
- Sahl, Michael
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- Salzedo, Carlos
- Sánchez-Gutiérrez, Carlos
- Satie, Érik
- Sauvé, Martial
- Savage, Danielle
- Savouret, Alain
- Sæther, Harald
- Scelsi, Giacinto
- Schafer, R Murray
- Scherchen, Tona
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- Schönberg, Arnold
- Schuback, Peter
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- Schuller, Gunther
- Schumacher, Marlon
- Schumann, Robert
- Schwitters, Kurt
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- Seta, Michal
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- Shinohara, Makoto
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- Siddall, Jon
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- Sigesmund, Darren
- Sikora, Elżbieta
- Simonis, Jean-Marie
- Sinti, I Wayan
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- Smetana, Bedřich
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- Steffler, Paul
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- Straffelini, Nicola
- Strauss, Richard
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- Sylvestrov, Valentin
- Szlavnics, Chiyoko
