The 33 Variations on a waltz by Anton Diabelli, Op. 120, commonly known as the Diabelli Variations, is a set of variations for the piano written between 1819 and 1823 by Ludwig van Beethoven on a waltz composed by Anton Diabelli. It is often considered to be one of the greatest sets of variations for keyboard along with J. S. Bach's Goldberg Variations.

Date of composition 1819
Type Variations
Tonality C Major
Catalogue Op. 120
Instruments Piano
Autotranslations beta Ludwig van Beethoven: 33 Variations on a waltz by Anton Diabelli en do majeur, Op. 120 "Diabelli Variations"
Ludwig van Beethoven: 33 Variations on a waltz by Anton Diabelli in do maggiore, Op. 120 "Diabelli Variations"
Ludwig van Beethoven: 33 Variations on a waltz by Anton Diabelli C-dur, Op. 120 "Diabelli Variations"