| William Parker | |
| Order: | Acting |
| Office: | Mayor of Boston, Massachusetts |
| Term Start: | January 6, 1845 |
| Term End: | February 27, 1845 |
| Office2: | Member of the Boston Board of Aldermen from Ward 10 |
| Term Start2: | 1846 |
| Term End2: | 1847 |
| Term Start3: | January 6, 1845 |
| Term End3: | March 6, 1845 |
| Term Start4: | 1842 |
| Term End4: | 1843 |
| Term5: | 1828 |
| Birth Date: | November 7, 1793 |
| Death Date: | October 29, 1873 |
| Party: | Whig |
| Spouse: | Julia Maria Stevens |
| Children: | Julia C. Parker, Sarah M. Parker, Grace Helen Parker |
| Profession: | Attorney |
William Parker (November 7, 1793 - October 29, 1873) was an American businessman and politician, who served as acting mayor of Boston, Massachusetts in early 1845.
He was an unsuccessful candidate in the 1844–45 and 1847 Boston mayoral elections.
Parker was one of thirteen children. Parker was the son of Bishop Samuel Parker and Ann (née Culter) Parker.