In music, Op. 33 stands for Opus number 33. Compositions that are assigned this number include:
Beethoven – Bagatelles, Op. 33 Chopin – Mazurkas, Op. 33 Dvořák – Piano Concerto Eberl – Symphony in E-flat Enescu – Chamber Symphony Frankel – Symphony No. 1 French – The Love for Three Oranges Glazunov – Symphony No. 3 Haydn – String Quartets, Op. 33 Jón Leifs – Requiem Kurtág – Stele Nielsen – Violin Concerto Rachmaninoff – Études-Tableaux, Op. 33 Saint-Saëns – Cello Concerto No. 1 Schoenberg – Zwei Klavierstücke Schumann – 6 Lieder (part songs for men's voices with piano ad lib) Sibelius – The Rapids-Rider's Brides (), song for soloist and orchestra (1897) Tchaikovsky – Variations on a Rococo Theme Wheeldon – Rococo Variations