Fanny Mendelssohn (14 November 1805 – 14 May 1847), later Fanny [Cäcilie] Mendelssohn Bartholdy and, after her marriage, Fanny Hensel, was a German composer and pianist.
She composed over 460 pieces of music.
Her compositions include a piano trio and several books of solo piano pieces and songs.
A number of her songs were originally published under her brother, Felix Mendelssohn's, name in his opus 8 and 9 collections.
Her piano works are often in the manner of songs, and many carry the name Lieder für das Pianoforte (Songs for the piano, a parallel to Felix's Songs without Words).
In Hamburg, the Fanny & Felix Mendelssohn Museum is dedicated to the lives and the work of Fanny and her brother Felix.