- Croisements (2018), 7:13Arr. Marie-Hélène Breault, 2020 [original work]4 flutes
- Croissant (2001), 18:00string quartet
- Crossroads (1974)flute, oboe (English horn), clarinet (bass clarinet), bassoon, 3 horns, 4 trumpets, 4 trombones, tuba, guitar, harp, ondes Martenot, organ, organ and harpsichord, piano, 6 percussions, violin, viola, cello and double bass
- Crossroads (version 1980) (1980)clarinet and fixed medium
- Crossworlds (2002), 27:00flute, piano and orchestra
- Crouching Tiger Concerto (2000)
- The Crown of Ariadne (1979)harp and fixed medium
- Cubes à sons / bruits / babils [Babbling / Sounding / Noising Cubes] (2006-08)sound installation
- Cycle, op 16 (1969)flute, clarinet, bass clarinet, bassoon, horn, 2 trumpets, 2 trombones and piano
- Cycle Saint-Denys Garneau (2010), 20:00mezzo-soprano, clarinet and guitar
- Cypresses, 3:00
