The Piano Trio No. 1 in B♭ major (Divertimento), K. 254, was written by Wolfgang Amadeus Mozart in 1776. It is scored for piano, violin and cello. Rachel Beckles Willson writes that it may have been inspired by Johann Christian Bach's harpsichord sonatas with accompanying violin and cello which Mozart heard in London in 1764. It is not known what occasion it was written for. The only record of a performance comes from one of Mozart's letters in which he reports performing it in a concert in Munich in 1777 on his journey to Paris. Although Mozart's autograph gives the work's title as a divertimento, in one of his letters he refers to it as Trio für Klavier ex B, and Kraus points out that the form and character have more in common with the trio than the divertimento.