Julie ("Giulietta") Guicciardi (23 November 1782 – 22 March 1856) was an Austrian countess. For a short time, she was a piano student of Ludwig van Beethoven. He dedicated his Piano Sonata No. 14 to her, which is now commonly known as the Moonlight Sonata.
- Steblin (2009, p. 96) showed that Guicciardi was not born in 1784, as usually reported, but two years earlier.