Prince Michal Jerzy Poniatowski (12 October 1736 – 12 August 1794) was a Polish nobleman.
Abbot of Tyniec and Czerwinsk (opat tyniecki i czerwinski), Bishop of Plock 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, Stanislaw August Poniatowski.
He was made a Royal Member of the Royal Society in 1791.