Sinfonietta for Children (Japanese: こどものための小交響曲 Kodomo no tame no shō-kōkyōkyoku) in B♭, Op. 24 (1943) is an orchestral composition by Japanese composer Saburō Moroi.
Written throughout October 1943 in the midst of the Second World War, the work was premiered by the Tokyo Broadcast Orchestra with Moroi conducting on 5 November 1943, just five days after the completion.[1]