- I am a strange loop (2022), 12:00saxophone quartet, harpsichord and recorder
- I do not know whether I was then a man dreaming I was a butterfly, or whether I am now a butterfly dreaming I am a man (2001), 28:00MIDI piano (Yamaha Disklavier) and chamber orchestra
- I.M.O.R.F. (Impetus Machine Overflow Rush Fallout) (2022), 18:00clarinet (processing), electric guitar, percussion, 2 Babel tables and siren organ
- Ic mun wax wode (2006), 7:00
- Icare-apprenti (1970)flute, 2 trumpets, ondes Martenot, 6 percussions and violin
- Idiorrhythmia (2020), indefinite durationun ou plusieurs instruments à cordes
- IF (1992)bass flute in
F - Igniting the Dawn (1996)flute, oboe, clarinet, piano, percussion, violin, cello and double bass
- Iikkii (froidure) (1972)flute (piccolo and flute in
G ), oboe, clarinet, bassoon, horn, trumpet, trombone, tuba, guitar, harp, piano (celesta), 2 percussions, violin, viola, cello and double bass - Ikaros agog… Daidalos on edge (2012), 21:00orchestra
- Iks-Repons (2009)
- Il adressa ces mots (1987)4 horns, 4 trumpets, 2 trombones, 2 tubas and 4 percussions
- Il concertino (1971)solo flute, clarinet, harmonium, piano, percussion, violin, cello and double bass
- Il divertimento barocco (1999), 13:00violin, harpsichord and string ensemble
- il suono blu (2005), 12:0010 musicians
- Il tempo di una canzone (2012)violin and piano
- Il Temps-te (2006), 12:00trumpet and processing
- Illumination II (1969), 22:00flute (piccolo, flute in
G ) and ocarina, B-flat clarinet (E -flat clarinet), bass clarinet, bassoon (double bassoon), horn inF , piano, percussion, violin, viola, cello, double bass and fixed medium - Illuminations (1987)8 violins, 3 violas, 2 cellos and double bass
- Les illuminations, op 18 (1939-40), 23:00soprano, 8 violins, 3 violas, 2 cellos and double bass
- Illusies van Harder en Zacht (2004-06), 16:00sheng, zheng, viola, cello
- Illusions (1971)cello
- Ilôts (2018)piano, violin, viola and cello
- 14 musicians
- Ilynx (version de chambre) (1968)clarinet, piano, 2 percussions and double bass
- (Im)pulses (2018), 9:00flute, clarinet, violin, cello and piano
- electric flute, electric piano, 2 percussions and electric double bass
- Imaginario I (1967), 7:00harpsichord and 3 percussions
