- 2 trumpets, 4 trombones, percussion and fixed medium
- KafKapriccio (2008), 19:00chamber orchestra
- Kaléidoscope (1947-49), 10:53
- Kâmê’a (1970)flute (piccolo), horn, trumpet, trombone, harp, 2 percussions and double bass
- Kammerkonzert (1923-25)flute (piccolo), oboe, clarinets in
E -flat and inA , bass clarinet, bassoon (double basson), 2 horns, English horn, trumpet, trombone, piano and violin - Kansha (2004), 10:002 flutes (piccolo, alto flute), oboe, clarinet (alto flute), trumpet, 2 percussions, cimbalom, piano (toy piano), harp and string quartet
- Karakurenai (2007, 11), 7:00
- Karnevalszeit (2022), 12:00
- Kassandra (1977), 23:1014 musicians and fixed medium
- Kassandra (1987), 20:00baritone (playing on a 20-string psaltery) and percussion
- Kata: san shi ryu (1982), 20:00flute, 5 percussions, 2 cellos and 2 double basses
- Katadrone (Contrecri) (1988)orchestra
- Katarakt Meer Katarakt (1995), 12:00soprano, 2 percussions and string quartet
- Katimavik (1967), 15:454-channel fixed medium
- Kebyar (1971)flute, clarinet, trombone, percussion, 2 double basses and fixed medium
- Arr. I Dewa Made Suparta
- Kekoba (1965)soprano, contralto, tenor, ondes Martenot and percussion
- Kensington Ceilidh (2018)piano, violin, viola and cello
- Khassa tunisien (2005), 6:07nay, oud, percussion and string quintet
- Khrônos (2010)sound installation
- Kinderstück (1924), 1:19piano
- Kinderszenen, op 15 (1838), 15:00piano
- percussion
- pianoCycle: One Minute More
- Kits (1995), 16:006 percussions, congas and electric bass
- Klavierstück, im Tempo eines Menuetts, op posth (1925), 1:33piano
- Klavierstück, op 33a (1929), 10:22piano
- Klavierstück, op 33b (1932), 6:40piano
- Klavierstück I, Nr 2/I (1952-55)piano
- Klavierstück II, Nr 2/II (1952-55)piano
