| W. Grant Smith | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Term: | 1939–1948 |
| Constituency: | Saint John City |
| Birth Date: | 11 January 1893 |
| Birth Place: | Saint John, New Brunswick |
| Death Place: | Saint John, New Brunswick |
| Spouse: | Elizabeth Barrie Haddow |
| Party: | Progressive Conservative Party of New Brunswick |
William Grant Smith (January 11, 1893 – July 16, 1957) was a Canadian politician. He served in the Legislative Assembly of New Brunswick as member of the Progressive Conservative party from 1939 to 1948.[1]