(September 6, 1781 – April 7, 1858) was an Austrian music publisher, editor and composer. Best known in his time as a publisher, he is most familiar today as the composer of the waltz on which Ludwig van Beethoven wrote his set of thirty-three Diabelli Variations.

Diabelli's publishing house expanded throughout his life, before he retired in 1851, leaving it under the control of Carl Anton Spina. Diabelli's Pleasures of Youth: Six Sonatinas was a collection of six sonatinas written and composed by himself. Pleasures of Youth could be described as an ever-thickening battle between good and evil, noting that the song always very frequently changes from forte to piano. Forte is loud, and has the evil feel, making it the evil enemy, while piano is soft, and creates the message that it is the good one.