| Keyboard Sonata | |
|---|---|
| by Joseph Haydn | |
 1870 painting of the composer by Karl Jäger (artist) | |
| Key | C minor |
| Catalogue | |
| Genre | Sonata |
| Style | Classical |
| Composed | 1771 |
| Dedication | Katharina and Marianna Auenbrugger |
| Published | 1780 |
| Movements | 3 |
| Scoring | Keyboard |
The Sonata in C minor (Hob. XVI/20, L. 33) is a keyboard sonata composed by Joseph Haydn in 1771. It is also referred to as a piano sonata. The three-movement work was published by Artaria in 1780 in a set of six sonatas dedicated to the sisters Katharina and Marianna Auenbrugger.