In music, Op. 65 stands for Opus number 65. Compositions that are assigned this number include:
Beethoven – Ah! perfido Brahms – Neue Liebeslieder Britten – Cello Sonata Chopin – Cello Sonata Dvořák – Piano Trio No. 3 Glazunov – Commemorative Cantata for the Centenary of the Birth of Pushkin Koechlin – Les Heures persanes Mendelssohn – Organ Sonatas, Op. 65 Prokofiev – Music for Children, Op. 65 Reger – Zwölf Stücke, Op. 65 Saint-Saëns – Septet in E major Schumann – Ritornelle in canonischen Weisen (7 canonic part songs) Shostakovich – Symphony No. 8 Sibelius – The Bells of Kallio Church (), transcription for solo piano (1912) Strauss – Die Frau ohne Schatten Weber – Invitation to the Dance