Op. 31
# Op. 31

In music, Op. 31 stands for Opus number 31. Compositions that are assigned this number include:

* Alkan – Preludes, Op. 31
* Barber – Summer Music
* Beethoven – Piano Sonata No. 16
* Beethoven – Piano Sonata No. 17
* Beethoven – Piano Sonata No. 18
* Britten – Serenade for Tenor, Horn and Strings
* Chopin – Scherzo No. 2
* Elgar – A Song of Flight
* Elgar – After
* Enescu – Vox Maris
* Farrenc – Piano Quintet No. 2
* Górecki – Symphony No. 2
* Gottschalk – Souvenir de Porto Rico
* Prokofiev – Tales of an Old Grandmother
* Rachmaninoff – Liturgy of St. John Chrysostom
* Saint-Saëns – Le rouet d'Omphale
* Schillings – Mona Lisa
* Schoenberg – Variations for Orchestra
* Schumann – 3 Gesänge
* Tchaikovsky – Marche slave
* Vierne – Vingt-quatre pièces en style libre
