In the span of 23 years, Lupu made over 20 recordings for Decca Records, and continues to be an exclusive Decca artist. His first recording was made in the spring of 1970. Lupu's solo recordings, which have received considerable acclaim, include works by Beethoven, Brahms, Grieg, Mozart, Schubert, and Schumann. His solo recordings without orchestra include 5 Beethoven piano sonatas (Opp. 13, 27/2, 49, and 53), as well as Beethoven's two rondos for piano (Op. 51) and 32 Variations in C minor; Brahms' Piano Sonata No. 3 in F minor (Op. 5), Two Rhapsodies (Op. 79), Intermezzi (Op. 117), 6 Pieces for Piano (Op. 118) and 4 Pieces for Piano (Op. 119); nine piano sonatas of Schubert (D. 157, 557, 664, 784, 845, 894, 958, 959, 960) as well as the Impromptus (D. 899, 935) and Moments musicaux (D. 780); and Schumann's Humoreske (Op. 20), Kinderszenen (Op. 15) and Kreisleriana (Op. 16). His concerto recordings include the complete cycle of Beethoven piano concertos with the Israel Philharmonic Orchestra conducted by Zubin Mehta; the Brahms Piano Concerto No. 1 (Op. 15) with the London Philharmonic Orchestra conducted by Edo de Waart; the Grieg and Schumann piano concertos with the London Symphony Orchestra and André Previn; and two Mozart piano concertos (K. 414 and 467) with the English Chamber Orchestra conducted by Uri Segal. His chamber music recordings for Decca include all of Mozart's sonatas for violin and piano with Szymon Goldberg; the violin sonatas of Debussy and Franck with Kyung Wha Chung; the quintets for piano and winds of Beethoven (Op. 16) and Mozart (K. 452) with Han de Vries, George Pieterson, Vicente Zarzo, and Brian Pollard; and various works by Schubert for violin and piano with Goldberg. He additionally recorded works of Mozart and Schubert for piano four-hands and two pianos with Murray Perahia for the CBS Masterworks, two albums of Schubert songs with Barbara Hendricks for EMI, and a disc of works by Schubert for piano four-hands with Daniel Barenboim for Teldec.