Ludwig van Beethoven's Concerto for Violin, Cello, and Piano in C major, Op. 56, commonly known as the Triple Concerto, was composed from 1803 to 1804, or beyond, and published in 1807 by Breitkopf & Härtel. The choice of the three solo instruments effectively makes this a concerto for piano trio, and it is the only concerto Beethoven ever completed for more than one solo instrument, and the only one he wrote for cello.

A typical performance takes about 37 minutes.

Beethoven's early biographer Anton Schindler claimed that the Triple Concerto was written for Beethoven's royal pupil, the Archduke Rudolf of Austria. Rudolf, who became an accomplished pianist and composer under Beethoven's tutelage, was only in his mid-teens at the time, and it seems plausible that Beethoven's strategy was to create a showy but relatively easy piano part that would be backed up by two more mature and skilled soloists. But there is no record that Rudolf ever performed the work, and several Beethoven scholars have questioned Schindler's claim.

The Triple Concerto premiered in May 1808, at the summer Augarten concerts in Vienna. The violin soloist was Carl August Seidler, and the cellist was Nikolaus Kraft, who was known for "technical mastery" and a "clear, rich tone". The concerto was Beethoven's first work to use advanced cello techniques.

In the published version, the concerto bore a dedication to a different patron, Prince Joseph Franz von Lobkowitz.

A piano trio version of the concerto was arranged by Carl Reinecke.

In addition to the violin, cello, and piano soloists, the concerto is scored for one flute, two oboes, two clarinets, two bassoons, two horns, two trumpets, timpani, and strings. The flute, oboes, trumpets, and timpani are tacet during the second movement.

The concerto is divided into three movements: