Clarinet–viola–piano trio

A clarinet–viola–piano trio, often titled "Trio for Clarinet, Viola and Piano" is a work of chamber music that is scored for clarinet, viola, and piano; or is the designation for a musical ensemble of a group of three musicians playing these instruments. This combination of instruments differs from other combinations, as the viola and the clarinet share approximately the same musical range, but not the same tone quality.

The Austrian composer Wolfgang Amadeus Mozart was the first to write for this combination of instruments with his "Kegelstatt" Trio, K. 498 (1786). which helped to popularize the clarinet in classical music. German composers Robert Schumann and Max Bruch also wrote early pieces for the clarinet, viola and piano; the combination has been increasingly written for during the modern era.