Piano Concerto No. 6 refers to the sixth piano concerto written by one of a number of composers:
Piano Concerto No. 6 (Beethoven) in D major, an arrangement of the Violin Concerto, Op. 61, for solo piano and orchestra (Op. 61a) Piano Concerto No. 6 (Beethoven) in D major, Hess 15 (incomplete) Piano Concerto No. 6 (Field) in C major Piano Concerto No. 6 (Mozart) in B-flat major Piano Concerto No. 6 (Prokofiev) (unfinished) Piano Concerto No. 6 (Ries) in C major
See also List of compositions for piano and orchestra