Prince Michał Jerzy Poniatowski (12 October 1736 – 12 August 1794) was a Polish nobleman. Abbot of Tyniec and Czerwińsk (opat tyniecki i czerwinski), Bishop of Płock and Coadjutor Bishop of Kraków (koadiutor krakowski) from 1773, and Archbishop of Gniezno and Primate of Poland from 1784. He was made a knight of the Order of the White Eagle on 25 November 1764. Nine days later, on 4 December, he was made a prince by his brother, the last king of Poland, Stanisław August Poniatowski. He was made a royal member of the Royal Society in 1791.