Princess Elisa Radziwill (Elisa Friederike Luise Martha; Polish: Eliza Fryderyka Luiza Marta Radziwill; 28 October 1803, Berlin – 27 August 1834, Bad Freienwalde) was a member of Polish nobility (of the Radziwill family, who were elite magnates), of royal ancestry.
She was the desired bride of Prince William of Prussia, who later became William I, German Emperor, but they were not allowed to marry.