| 1981 | Mozart: Duos for Violin and Viola K. 423 & 424 / Haydn: Duo No.1 for Violin and Viola | Mozart, Michael Haydn; Mark Lubotsky, Nobuko Imai | | 1 |
| 1982 | The Clarinet in Concert | Bruch, Mendelssohn, Crusell; Thea King, Georgina Dobrée, Nobuko Imai, London Symphony Orchestra, Alun Francis | | 2 |
| 1987 | Brahms: Sonatas for Viola and Piano / Schumann: Märchenbilder | Brahms, Schumann; Nobuko Imai, Roger Vignoles | | 1 |
| 1987 | The Russian Viola | Nobuko Imai, Roland Pöntinen | | 1 |
| 1989 | In Memoriam / Viola Concerto | Alfred Schnittke; Nobuko Imai, Malmo Symphony Orchestra, Lev Markiz | | 1 |
| 1990 | Symphony no. 5 / Viola Concerto | Allan Pettersson; Nobuko Imai, Malmö Symphony Orchestra, Moshe Atzmon, Lev Markiz | 5 | 1 |
| 1990 | Mozart: Trio no. 4, K498 "Kegelstatt-Trio" / Schumann: Märchenerzählungen, op. 132 / Bruch: 8 Pieces, op. 83 | Mozart, Schumann, Bruch; Nobuko Imai, Janet Hilton, Roger Vignoles | | 1 |
| 1991 | The Frescos of Piero della Francesca / Rhapsody-Concerto / Double Concerto | Bohuslav Martinů; Malmö Symphony Orchestra, James DePreist, Nobuko Imai | | 1 |
| 1991 | Works for Chamber Orchestra | Edison Denisov; Nobuko Imai, Petra Vahle, Annelie de Man, Nieuw Sinfonietta Amsterdam, Lev Markiz | | 1 |
| 1992 | The Four Sonatas for Solo Viola | Paul Hindemith; Nobuko Imai | | 1 |
| 1992 | Piano Concerto no. 1 / Two Songs, op. 91 | Brahms; Stephen Kovacevich, Ann Murray, Nobuko Imai, London Philharmonic Orchestra, Wolfgang Sawallisch | 5 | 2 |
| 1992 | Viola Concerto "A String Around Autumn" / "November Steps" / Eclipse for Shakuhachi and Biwa | Takemitsu; Nobuko Imai, Saito Kinen Orchestra, Seiji Ozawa | | 1 |
| 1994 | The Sonatas for Viola and Piano / Meditation | Paul Hindemith; Nobuko Imai, Roland Pöntinen | | 2 |
| 1994 | Ishavet / Viola Concerto (Hommage à la France) / Sinfonia Concertante for Cello and Orchestra | Gösta Nystroem; Malmö Symphony Orchestra, Paavo Järvi, Nobuko Imai, Niels Ullner | | 1 |
| 1996 | Viola Bouquet | Nobuko Imai, Roland Pöntinen | | 1 |
| 1997 | A Bird Came Down the Walk | Nobuko Imai, Roland Pöntinen | | 1 |
| 2001 | Sinfonia Concertante in E-flat major / Concerto for Violin, Piano and Orchestra in D major | Mozart; Midori, Nobuko Imai, Christoph Eschenbach, NDR-Sinfonieorchester | | 1 |
| 2003 | Viola Space Japan 10th Anniversary | Imai, Kawasaki, Tanumura | | 1 |
| 2003 | Nobuko Imai, Sharon Bezaly, Ronald Brautigam Play Chamber Music by Duruflé, Hahn, Weinberg, Nikolayeva | Duruflé, Hahn, Weinberg, Nikolayeva; Nobuko Imai, Sharon Bezaly, Ronald Brautigam | | 1 |
| 2004 | Antiquities | Bach, Dowland, Isaac, Machaut; Nobuko Imai, Mie Miki | | 1 |
| 2005 | Chamber Music | Sergey Taneyev; Vadim Repin, Ilya Gringolts, Nobuko Imai, Lynn Harrell, Mikhail Pletnev | | 1 |
| 2006 | 'Trout' Quintet / Adagio & Rondo Concertante | Schubert; Trio Fontenay, Nobuko Imai, Chi-Chi Nwanoku | | 1 |
| 2006 | 250ème anniversaire N°13 : Quintette à cordes | Mozart; Quatuor Orlando, Nobuko Imai | | 2 |
| 2006 | Goldberg Variations | Bach; Rachlin, Imai, Maisky | 5 | 1 |
| 2014 | Quintets | Mozart; Orlando Quartet, Nobuko Imai, Vertavo Quartet, Martin Fröst, Berlin Philharmonic Wind Quintet, Stephen Hough, Ensemble Villa Musica | | 1 |
| 2015 | Toru Takemitsu: November Steps; Viola Concerto; Corona | Toru Takemitsu, Nobuko Imai, Roger Woodward, Seiji Ozawa & Saito Kinen Orchestra | | 1 |
| 2016 | Complete String Quintets | Wolfgang Amadeus Mozart; Auryn Quartet, Nobuko Imai | | 1 |
| 2020 | Piano Quintet | César Franck; Marc-André Hamelin, Joshua Bell, Pamela Frank, Nobuko Imai, Steven Isserlis | | 1 |
| — | Concerto for Orchestra / Triple Concerto | Tippett; London Symphony Orchestra, Sir Colin Davis, Pauk, Imai, Kirshbaum | | 1 |
| — | Complete String Quintets | W.A. Mozart; The Orlando Quartet, Nobuko Imai | | 1 |
