The Geistervariationen (Ghost Variations), or Theme and Variations in E-flat major for piano, WoO 24, composed in 1854, are the last piano work of Robert Schumann. They were composed in the time leading up to his admission to an asylum for the insane and are infrequently played or recorded today.
This work was Schumann's last before he was admitted to the mental hospital in Bonn-Endenich, and also his last published. Wolf-Dieter Seiffert wrote in the preface to Thema mit Variationen (Geistervariation) that at this time of his life, Schumann believed that he was surrounded by spirits who played him music, both "wonderful" and "hideous". They offered him "most magnificent revelations", but also threatened to send him to Hell. Seiffert goes on to write that on 17 or 18 February 1854, Schumann wrote down a theme he said was dictated to him by voices like those of angels (although this was actually a theme which he had written previously). Several days later, he wrote a set of variations on this theme. While he was still working on the composition, he suddenly threw himself on 27 February half clothed into the freezing Rhine, from which he was rescued and returned home. After surviving the suicide attempt, he continued to work on it. The next day, he completed the work and sent the manuscript to his wife, Clara, who had already withdrawn the night before, on the advice of a doctor.
- Theme – Leise, innig
- Variation I
- Variation II – Canonisch
- Variation III – Etwas belebter
- Variation IV
- Variation V
Works which quote WoO 24 
- Brahms: Variations on a Theme of Robert Schumann, piano four hands, Op. 23
- Aribert Reimann: Seven Fragments for Orchestra in memory of Robert Schumann (1988)
- Tori Amos: "Your Ghost" (Night of Hunters, 2011)
- Wolf-Dieter Seiffert (1995). "Preface to Thema mit Variationen (Geistervariation)". G. Henle Verlag. Retrieved 6 July 2012.
- Fiona Maddocks (3 September 2011). "Schumann: Geistervariationen – review". The Observer. Retrieved 6 July 2012.
- Michael Tumelty (3 October 2011). "Schumann’s Ghost Variations reveal the dark side of the composer’s art". The Herald (Glasgow). Retrieved 6 July 2012.