Prince Michał Hieronim Radziwiłł (1744-1831) was a Polish szlachcic, Knight of the Order of the White Eagle, awarded on September 7, 1773.
Ordynat of Kleck , Ołyka and Nieśwież , Great Sword-bearer of Lithuania since 1771, castellan of Wilno since 1775, voivode of Wilno Voivodship since 1790, Starost grabowski, komorowski, kraszewicki, and miksztadzki.
Marshal of Sejm (nadzwyczajnego delegacyjnego) on April 19, 1773 - April 11, 1775 in Warsaw.
Married to Helena Przeździecka since April 26, 1771.