| Honorific-Prefix: | The Honourable |
| Clement O'Leary | |
| Riding: | Antigonish—Guysborough |
| Term Start: | March 1958 |
| Term End: | June 1962 |
| Predecessor: | Angus Ronald MacDonald |
| Successor: | John Benjamin Stewart |
| Birth Name: | Clement Augustine O'Leary |
| Birth Date: | 26 June 1916 |
| Birth Place: | Lochaber, Nova Scotia, Canada |
| Profession: | Insurance agent, insurance supervisor |
| Party: | Progressive Conservative |
Clement Augustine O'Leary (26 June 1916 – 12 June 1969) was a Progressive Conservative party member of the House of Commons of Canada and member of the Senate of Canada. He was born in Lochaber, Nova Scotia whose career was based in the insurance industry.
He was first elected to Parliament at the Antigonish—Guysborough riding in the 1958 general election and served one term, the 24th Parliament, after which he was defeated in the 1962 federal election.
O'Leary was appointed to the Senate on 25 September 1962 under the John Diefenbaker administration and remained a member there until his death in June 1969.