The Variations on a Theme by Joseph Haydn, (German: Variationen über ein Thema von Jos. Haydn), now also called the Saint Anthony Variations, is a work in the form of a theme and variations, composed by Johannes Brahms in the summer of 1873 at Tutzing in Bavaria. It consists of a theme in B♭ major based on a "Chorale St Antoni", eight variations, and a finale. The work was published in two versions: for two pianos, written first but designated Op. 56b; and for orchestra, designated Op. 56a.

Date of composition 1873 in Tutzing, Germany
First published 1873
Tonality B-flat Major
Catalogue Op. 56b
Approx. duration 18 minutes
Instruments Piano
Arrangements Johannes Brahms: Variations on a Theme by Joseph Haydn in B-flat major, Op. 56a
Autotranslations beta Johannes Brahms: Variations on a Theme by Joseph Haydn en si bémol majeur, Op. 56b
Johannes Brahms: Variations on a Theme by Joseph Haydn in si bemolle maggiore, Op. 56b
Johannes Brahms: Variations on a Theme by Joseph Haydn B-dur, Op. 56b