- [Switch~ Ensemble]
- S[ILK]S
- Sacks, Rick
- Sailor, Janna
- Sainct Laurens
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- Saint-Gelais, Hughes
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- Saint-Jacques, Anne-Marie
- Saint-Saëns, Camille
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- Saunders, Shari
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- Schneller, Oliver
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- Schryer, Claude
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- Schulich Ensemble
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- SEMensemble
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- SHHH!! Ensemble
- Siamois Synthesis
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- Six voix solistes
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- Sontaient trois
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- Spin Ensemble
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- Splice
- St John, Lara
- St-Jak, Pierre
- St-Jak Quartet Off-On
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- St-Onge, Antoine
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- Standing Wave
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- Structural Damage
- Studio de musique ancienne de Montréal
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- SuperNova String Quartet
- Supernova4
- Sura, Alexandru
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- Sylvestre, Gaston
- Sylvestrov, Valentyn
- Szabó, Krisztina
- Szeto, Jennifer
