Jean Mercier may refer to:
Jean Mercier (engineer) (1901–1971), French engineer Jean Le Mercier (died 1397), French politician, advisor to kings Charles V and Charles VI Jean Mercier (Hebraist) (died 1570), French Hebraist Jean Ernest Mercier (1840–1907), French translator, historian and politician
See also Jean Mercer (fl. 1950s–2010s), American developmental psychologist and professor