Prince Michał Kazimierz Radziwiłł (Lithuanian: Mykolas Kazimieras Radvila, Belarusian: Міхал Казімер Радзівіл; 13 June 1702 – 15 May 1762) was a Polish-Lithuanian noble.

Ordynat of Niasviž and Olyka, owner of Biržai, Dubingiai, Slutsk, Kopyła and Shumsk.

Like his father, he was the starost of a number of towns, including Przemyśl, Bratslav, Kamianets-Podilskyi, Człuchów, Krzeczów, Ovruch, Nowy Targ, Parczew, Osiek and Kaunas.

[2] His former lover was Maria Karolina Sobieska, granddaughter of John III Sobieski.

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