The Sonata in B minor for transverse flute and obbligato harpsichord by Johann Sebastian Bach (BWV 1030) is a sonata in 3 movements:

• Andante
• Largo e dolce
• Presto

The existing autograph manuscript dates from after 1735, when Bach led the Collegium Musicum in Leipzig. There are errors in the manuscript, and another harpsichord part in G minor that is otherwise the same though transposed, that suggests that this, like the G minor and D major harpsichord concertos, may be among the works Bach transcribed from earlier works originally for other instrumental combinations and in other keys to be playable by performers at hand.^{[dubious – discuss][1]}