In music, Op. 3 stands for Opus number 3. Compositions that are assigned this number include:
Bach – Organ concerto Beethoven – String Trio Berg – String Quartet Britten – A Boy Was Born Chopin – Introduction and Polonaise brillante Dvořák – Symphony No. 1 in C minor "The Bells of Zlonice" Gottschalk – La Savane Handel – Concerti Grossi, Op. 3 Haydn – String Quartets, Op. 3 Kreisler – Tambourin Chinois Mendelssohn – Piano Quartet No. 3 Myaskovsky – Symphony No. 1 Rachmaninoff – Morceaux de fantaisie Rachmaninoff – Prelude in C-sharp minor Rautavaara – A Requiem in Our Time Schumann – Etudes After Paganini Caprices Sibelius – "", art song (1911) Stamitz – Symphony in D major, Op. 3, No. 2 Strauss – Wiener Carneval Stravinsky – Scherzo fantastique Tchaikovsky – The Voyevoda Vivaldi – L'estro armonico Zemlinsky – Clarinet Trio