| William J. Manson | |
| Office: | Member of the Legislative Assembly of British Columbia |
| Predecessor: | Richard McBride |
| Successor: | John Oliver |
| Term Start: | 1907 |
| Term End: | 1916 |
| Constituency: | Dewdney |
| Birth Date: | 19 August 1872 |
| Birth Place: | Shetland Islands |
| Death Place: | Vancouver, British Columbia |
| Spouse: | Christina Agnes Duncan |
| Party: | British Columbia Conservative Party |
| Occupation: | Magistrate |
| Residence: | Mission, British Columbia Hatzic, British Columbia |
William J. Manson (August 19, 1872 – January 19, 1948) was a Canadian politician. He served in the Legislative Assembly of British Columbia from a 1907 byelection until his defeat in the 1916 election, from the electoral district of Dewdney, a member of the Conservative party.[1]