The Violin Sonata No. 4 (also known as the Duo or Grand Duo) in A major, Op. posth. 162, 574, for violin and piano by Franz Schubert was composed in 1817. This sonata, composed one year after his first three violin sonatas, was a much more individual work, showing neither the influence of Mozart, as in these previous works, nor of Rossini, as in the contemporaneous 6th Symphony.
The Sonata has four movements: