| H. Colby Smith | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Term: | 1926–1939 |
| Constituency: | Saint John County |
| Birth Date: | 21 August 1869 |
| Birth Place: | York County, New Brunswick |
| Death Place: | Saint John, New Brunswick |
| Spouse: | Mary Maud Gregory |
| Party: | Progressive Conservative Party of New Brunswick |
| Occupation: | businessman |
| Children: | Alphonso C. Smith |
| Alma Mater: | Lancaster, New Brunswick |
Harry Colby Smith (August 21, 1869 – May 14, 1953) was a Canadian politician. He served in the Legislative Assembly of New Brunswick as a member of the Progressive Conservative Party from 1926 to 1939.[1] His father, Albert Colby Smith, along with his son, Alphonso C. Smith also served in the Legislative Assembly.