Sinfonia in D major, BWV 1045

Sinfonia in D major, BWV 1045, specifically known as, Violin Concerto movement BWV 1045, is an orchestral work for solo violin, three trumpets, timpani, two oboes, strings and Continuo by Johann Sebastian Bach. A late work composed in Leipzig between c. 1742 and 1746, surviving only as a fragment, the Concerto is often considered a sinfonia of a lost cantata.

Eric David Mackerness in Music Review described BWV 1045 as "second rate Bach" and violinistically "unmanageable".