The Orchestral Suite in G minor, BWV 1070 is a work by an unknown composer.
Evidence for its not being by the older composer includes the form of the opening movement, which differs from that used in the suites known to be by him, and the fact that the third movement is in a different key to the rest of the work, whereas J. S. Bach's suites are homotonal.
Modern publications of the suite derive from a collection of manuscript parts prepared by Christian Friedrich Penzel, one of J. S. Bach's last pupils, in 1753.
In 1950, Wolfgang Schmieder assigned to the suite the number 1070 in the Bach-Werke-Verzeichnis (BWV) catalogue.
The British musicologist Nicholas Kenyon writes that the suite is "certainly not by J. S. Bach", and that it is "likely to be by an unknown composer or possibly W. F.