Hieronim is the Polish form of Hieronymus and may refer to:
- Adam Hieronim Sieniawski (1576–1616) (1576–1616), Polish–Lithuanian noble
- Adam Hieronim Sieniawski (1623–1650) (1623–1650), Polish noble
- Dominik Hieronim Radziwiłł (1786–1813), Lithuanian nobleman
- Hieronim Augustyn Lubomirski (1647–1706), Polish noble (szlachcic), magnate, politician and military commander
- Hieronim Barczak (born 1953), Polish footballer
- Hieronim Chodkiewicz (1500–1561), Vilnius ciwun in 1542
- Hieronim Czarnowski (1834–1902), Polish chess master and activist
- Hieronim Dekutowski (1918–1949), a Polish boyscout and soldier, who fought in Polish September Campaign
- Hieronim Florian Radziwiłł (1715–1760), Polish-Lithuanian szlachcic
- Hieronim Jarosz Sieniawski (1516–1579), Polish noble
- Hieronim Morsztyn (1581–1623), Polish poet
- Hieronim Radziejowski (1612–1667), Polish szlachcic
- Hieronim Wietor (ca. 1480–1546/47), printer in Vienna and Kraków
- Hieronim Wincenty Radziwiłł (1759–1786), Polish-Lithuanian nobleman
- Hieronim Wołłowicz of Bogorya Coat of Arms, born in 16th century, Lithuanian vice-chancellor and Lithuanian grand treasurer
- Michał Hieronim Radziwiłł (1744–1831), Lithuanian noble, Knight of the Order of the White Eagle
- Michał Hieronim Krasiński (1712–1784), Polish noble, cupbearer of Stężyca, podkomorzy of Różan, starosta of Opiniogóra
- Mikołaj Hieronim Sieniawski (1645–1683), Polish noble (szlachcic), military leader, politician
- Władysław Hieronim Sanguszko (1803–1870), Polish noble (szlachcic), conservative politician
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