The Sonata for Solo Violin (or Sonata for Unaccompanied Violins in Unison) in D major, Opus 115, is a three-movement work for unaccompanied violin composed by Sergei Prokofiev in 1947.

It was commissioned by the Soviet Union's Committee of Arts Affairs as a pedagogical work for talented violin students.

[1] It is therefore a non-virtuosic piece, and was originally designed to be played not by one soloist but by multiple young performers in unison.

[2] It was not performed until 10 July 1959 - six years after Prokofiev's death - by Ruggiero Ricci at the Moscow Conservatory.

[1] The three movements of the sonata are as follows: The work is composed in Classical style and its melodies are largely diatonic.