| William Henry Harrison | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Term Start: | 1925 |
| Term End: | 1935 |
| Constituency: | Saint John City |
| Birth Date: | 25 September 1880 |
| Birth Place: | Saint John, New Brunswick |
| Death Place: | Saint John, New Brunswick |
| Spouse: | Constance Roy Inches |
| Party: | Conservative Party of New Brunswick |
| Occupation: | lawyer, judge |
| Children: | three |
| Residence: | Saint John, New Brunswick |
William Henry Harrison (September 25, 1880 – July 18, 1955) was a Canadian politician. He served in the Legislative Assembly of New Brunswick as member of the Conservative party representing Saint John City from 1925 to 1935,[1] and was Attorney General of New Brunswick from 1933 to 1935.