Princess Klementyna Czartoryska (1780–1852) was a Polish noblewoman, the author of a diary, which has been published. She was the daughter of Józef Klemens Czartoryski and Dorota Barbara Jabłonowska. She married Prince Eustachy Erazm Sanguszko on 26 June 1798 in Slavuta and had three children: Dorota (1799-1831), Roman (1800-81), and Władysław (1803–70). Her husband, meanwhile, was having an affair with Julia Lubomirska.