In music, Op. 19 stands for Opus number 19. Compositions that are assigned this number include:

Barber – Symphony No. 2

Bartók – The Miraculous Mandarin

Beethoven – Piano Concerto No. 2

Castelnuovo-Tedesco - Cantico

Chausson – Poème de l'amour et de la mer

Chopin – Boléro

Dohnányi – Suite in F-sharp minor

Elgar – Froissart Overture

Fauré - Ballade in F-sharp major

Kabalevsky – Symphony No. 2

Kahn - Piano Trio No. 1

Kosenko – Eleven Études in the Form of Old Dances

Larsson - Pastoral Suite

Lindblad - Symphony No. 1 in C-major

Mendelssohn - Songs without Words, Book I

Mosolov – Iron Foundry

Prokofiev – Violin Concerto No. 1

Rachmaninoff – Cello Sonata

Ries – Violin Sonata No. 10

Schoenberg – Sechs kleine Klavierstücke

Schumann – Blumenstück

Stenhammar - Violin Sonata in A-minor

Szymanowski – Symphony No. 2

Weber – Symphony No. 1

Op. 19