| Don Blenkarn | |
| Constituency Mp: | Peel South |
| Parliament: | Canadian |
| Predecessor: | Hyliard Chappell |
| Successor: | Anthony Abbott |
| Term Start: | 1972 |
| Term End: | 1974 |
| Constituency Mp2: | Mississauga South |
| Parliament2: | Canadian |
| Predecessor2: | District was created in 1976 |
| Successor2: | Paul Szabo |
| Term Start2: | 1979 |
| Term End2: | 1993 |
| Birth Date: | 17 June 1930 |
| Birth Place: | Toronto, Ontario, Canada |
| Birth Name: | Donald Alex Blenkarn |
| Death Place: | New Smyrna Beach, Florida, US[1] |
| Party: | Progressive Conservative |
| Children: | 3 |
| Residence: | Mississauga, Ontario |
| Alma Mater: | University of British Columbia |
| Occupation: | Lawyer, farmer |
Donald Alex Blenkarn (June 17, 1930 – January 30, 2012) was a Progressive Conservative Party of Canada Member of Parliament.
Blenkarn was born in Toronto. A lawyer and businessman by profession, he was elected in 1972 to represent the riding of Peel South. He held on the riding until the 1974 election when he was defeated by Liberal Anthony Abbott. He was re-elected to the House of Commons as the Member of Parliament for Mississauga South in 1979 and served as the Chairman of the House of Commons Finance Committee during the Mulroney years. He was defeated by Liberal Paul Szabo in the 1993 election.
Blenkarn owned a tree farm later in life in Hockley Valley.