Totentanz : Paraphrase on Dies irae, S.126, is the name of a work for solo piano and orchestra by Franz Liszt notable for being based on the Gregorian plainchant melody Dies irae as well as for stylistic innovations. It was first planned in 1838, completed and published in 1849, and revised in 1853 and 1859.

"Dies irae" is a Latin sequence attributed to either Thomas of Celano of the Franciscans (1200–1265) or to Latino Malabranca Orsini, lector at the Dominican studium at Santa Sabina, the forerunner of the Pontifical University of Saint Thomas Aquinas in Rome. The sequence dates from the 13th century at the latest, though it is possible that it is much older, with some sources ascribing its origin to St. Gregory the Great, Bernard of Clairvaux (1090–1153), or Bonaventure (1221–1274).