In music, Op. 15 stands for Opus number 15. Compositions that are assigned this number include:
Alkan – Trois morceaux dans le genre pathétique Bartók – Five Songs, Op. 15 Beethoven - Piano Concerto No. 1 Brahms – Piano Concerto No. 1 Britten – Violin Concerto Chopin – Nocturnes, Op. 15 Dvořák – Ballade Elgar – Chanson de Nuit Fauré – Piano Quartet No. 1 Gál – Die heilige Ente Gottschalk – The Banjo Madetoja – Kullervo, symphonic poem for orchestra (1913) Myaskovsky – Symphony No. 3 Berlioz – Grande symphonie funèbre et triomphale Saint-Saëns – Serenade in E-flat major Schoenberg – The Book of the Hanging Gardens Schubert – Wanderer Fantasy Schumann – Kinderszenen Shostakovich – The Nose Sibelius – The Wood Nymph (), tone poem for orchestra (1895) Somov – Winternacht Strauss – Sträußchen Szymanowski – Symphony No. 1 Weill – Der Protagonist