Hieronimus is a surname. Notable people with the surname include:
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Carl Hieronimus Gustmeyer (1701–1756), Danish merchant
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Nicolas Hieronimus
Nicolas Hieronimus (born 3 January 1964), is a French businessman, and the CEO of the L’Oréal Group since May 1, 2021, the sixth CEO in the history of the group, taking the place of Jean-Paul Agon, who remains the chairman of the group.
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(born 1964), French businessman
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Robert Richard Hieronimus (born 1943), American educator, artist, author, and activist
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