In music, Op. 25 stands for Opus number 25. Compositions that are assigned this number include:
Beethoven – Serenade for flute, violin and viola
Berlioz – L'enfance du Christ
Brahms – Piano Quartet No. 1
Britten – String Quartet No. 1
Chausson – Poème
Chopin – Études Op. 25
D'Indy – Symphony on a French Mountain Air
Dohnányi – Variations on a Nursery Tune
Dvořák – Vanda
Elgar – The Black Knight
Enescu – Violin Sonata No. 3
Holst – Sāvitri
Klebe – Die Räuber
Kosenko – Twenty-four Pieces for Children
Mendelssohn – Piano Concerto No. 1
Prokofiev – Symphony No. 1
Rachmaninoff – Francesca da Rimini
Rubinstein – Piano Concerto No. 1
Sarasate – Carmen Fantasy
Schoenberg – Suite for Piano
Schubert – Die schöne Müllerin
Schumann – Myrthen, twenty-six songs (4 books) Strauss – Guntram Szymanowski – Hagith