120, is a sonata for solo piano composed by Franz Schubert in the summer of 1819.

[2] The manuscript, completed in July 1819, was dedicated to 18-year-old Josephine von Koller of Steyr in Upper Austria, whom he considered to be "very pretty" and "a good pianist".

The lyrical, buoyant, in spots typically poignant nature of this sonata fits the image of a young Schubert in love, living in a summery Austrian countryside, which he also considered to be "unimaginably lovely".

[5] James Webster noted the particular A–B–A form of the first movement's first thematic group.

[7] Leo Black noted Schubert's reworking of the opening theme from the sonata's slow movement into his song "Der Unglückliche".