Josiah Quincy is the name of:
- Colonel Josiah Quincy I (1709-1784), Revolutionary War soldier
- Josiah Quincy II (1744-1775), American lawyer
- Josiah Quincy III (1772-1864), president of Harvard University (1829-1845), US representative (1805-1813), mayor of Boston (1823-1828)
- Josiah Quincy, Jr. (1802-1882), mayor of Boston (1846-1848)
- Josiah Phillips Quincy (1829-1910), lawyer and writer
- Josiah Quincy (1859-1919), mayor of Boston (1895-1899)
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