Prince Kazimierz Czartoryski (4 March 1674 – 31 August 1741) was a Polish nobleman, Duke of Klewan and Zuków.
Kazimierz became Podczaszy of Lithuania since 1699, Grand Treasurer of Lithuania in 1707–1709, nominated by King Stanislaw Leszczynski.
He was also Deputy Chancellor of Lithuania in 1712–1724.
Castellan of Vilnius since 1724 and starost of Krzemieniec, Wieliz and Uswiaty.
He founded the "Familia" during the interregnum in 1696–1699.
He supported the candidature of François Louis, Prince of Conti for the Polish throne in 1697.