- Saariaho, Kaija
- Sabet, Parisa
- Sacks, Rick
- Sahl, Michael
- Saint-Denis, Patrick
- Saint-Pierre, Christian
- Saint-Saëns, Camille
- Salonen, Esa-Pekka
- Salvador, Matilde
- Salzedo, Carlos
- Samandari, Farshid
- Sánchez-Gutiérrez, Carlos
- Sandred, Örjan
- Sarasate, Pablo de
- Satie, Érik
- Sauvé, Martial
- Savage, Danielle
- Savouret, Alain
- Sæther, Harald
- Scali, Gaëlle
- Scelsi, Giacinto
- Schaeffer, Pierre
- Schafer, R Murray
- Scherchen, Tona
- Schick, Ignaz
- Schmitt, Markus
- Schneller, Oliver
- Schnittke, Alfred
- Schoen, Matthew
- Schoenberg, Arnold
- Schryer, Claude
- Schuback, Peter
- Schubert, Franz
- Schuller, Gunther
- Schumacher, Marlon
- Schumann, Clara
- Schumann, Robert
- Schwitters, Kurt
- Sciarrino, Salvatore
- Scriabine, Alexandre
- Sebastián, Maitane
- Selleck, Johanna
- Senécal, Pierre-Luc
- Seta, Michal
- Seter, Mordechai
- Settel, Zack
- Sexton, Erin
- Shalabi, Sam
- Sharifi, Jamshied
- Sharkya’, Vergil
- Sharman, Rodney
- Sheets, Zach
- Shi, Fuhong
- Shinohara, Makoto
- Shostakovich, Dmitri
- Sibelius, Jean
- Siddall, Jon
- Sigal, Rodrigo
- Sigesmund, Darren
- Sighicelli, Samuel
- Sikora, Elżbieta
- Simonis, Jean-Marie
- Sinti, I Wayan
- Slean, Sarah
- Słyż, Aleksandra
- Smalley, Denis
- Smetana, Bedřich
- Smith, Linda Catlin
- Smith, Michel A
- Smyth, Ethel
- Snæbjörnsdóttir, Bergrún
- Soddell, Thembi
- Sodeika, Gintaras
- Sohal, Naresh
- Sokolović, Ana
- Somers, Harry
- Sondheim, Stephen
- Sonstevold, Gunnar
- Sosa, Raoul
- Souster, Tim
- Southam, Ann
- Sørensen, Bent
- Sørlie, Stine
- Spiteri, Vivienne
- St-Arnaud, Francis
- St-Jak, Pierre
- St-Onge, Alexandre
- Stahnke, Manfred
- Stalvey, Dorrance
- Staniland, Andrew
- Stanović, Adam
- Stark, Bruce
- Stawarska-Beavan, Magda
- Steen-Andersen, Simon
- Steenhuisen, Paul
- Steffler, Paul
- Stenhammar, Wilhelm
- Steven, Donald
- Stevenson, Robert W
- Stewart, Amanda
- Stewart, D Andrew
- Stibilj, Milan
- Stockhausen, Karlheinz
- Storring, Nick
- Straesser, Joep
- Straffelini, Nicola
- Strauss, Richard
- Stravinsky, Igor Fyodorovich
- Strizich, Robert
- Sueyoshi, Yasuo
- Supponen, Lauri
- Swinnen, Peter
- Sylvestrov, Valentyn
- Szlavnics, Chiyoko