| Election Name: | 1821 Massachusetts gubernatorial election |
| Country: | Massachusetts |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1820 Massachusetts gubernatorial election |
| Previous Year: | 1820 |
| Next Election: | 1822 Massachusetts gubernatorial election |
| Next Year: | 1822 |
| Election Date: | April 2, 1821 |
| Nominee1: | John Brooks |
| Party1: | Federalist Party |
| Popular Vote1: | 28,608 |
| Percentage1: | 58.28% |
| Nominee2: | William Eustis |
| Party2: | Democratic-Republican Party |
| Popular Vote2: | 20,268 |
| Percentage2: | 41.29% |
| Governor | |
| Before Election: | John Brooks |
| Before Party: | Federalist Party |
| After Election: | John Brooks |
| After Party: | Federalist Party |
The 1821 Massachusetts gubernatorial election was held on April 2, 1821.
Incumbent Federalist Governor John Brooks won re-election to a sixth term, defeating Democratic-Republican nominee William Eustis.