Gitaar met 2 andere instrumenten, O
| Naam | Compositie | bezetting | |
| O'Brien | Christian | Didig Hapus | trp-trb-gtr |
| O'Brien | Christian | Pit_t | trp-trb-gtr |
| Oehring | Helmut | ICH.STILLE. (aus: Rehnebel/Opfer/Puderfinger) | fl(b)-gtr-perc-CD |
| Olofsson | Kent | The Garden Of Earthly Delights (gtr-kamerensemble-tape) | gtr-ens-tape |
| Orff | Carl | Einzug ud Reigen | bl.fl-gtr-vc |
| Ortiz-Alvarado | William | A Sensitive Mambo in Transformation (e.gtr-synth-perc-e.bas) 1991 | e.gtr-synth-e.bas-perc |
| Ortiz-Alvarado | William | Amor, Cristal y Piedra, guitar, harp and hapsichord (1980) | gtr-hrp-clav |
| Österling | Fredrik | Nine – The Esoteric Charm of Austerity | fl-vla-gtr |
| Owen | Jerry | Gypsy Inspirations (fluit,altviool en gitaar) | fl-vla-gtr |
| Owen | Jerry | Spillville var. on a theme by Dvorák - var. 14 Double Variat | fl-vla-gtr |
| Owen | Jerry | Trio Concertante over Czech Folksongs | fl-vla-gtr |