The Sinfonietta in C major, Op. 10, is a three-movement composition for string orchestra written in 1932 by the Swedish composer Lars-Erik Larsson. The piece premiered in Gothenburg on 14 December 1932 with Tor Mann conducting the Gothenburg Orchestral Society. A few years later, on 5 April 1934 at the International Society for Contemporary Music (ISCM) World Music Days in Florence, Hermann Scherchen conducted the Sinfonietta to considerable acclaim, scoring for Larsson the first international success of his career. In response, Universal Edition in Vienna signed a contract with the composer and published a number of his early works, among them the Sinfonietta, the Little Serenade, and the Concert Overture No. 2.