| Honorific-Prefix: | The Hon. |
| Mary Elizabeth Kinnear | |
| Office: | Senator for Welland, Ontario |
| Appointed: | Lester B. Pearson |
| Term Start: | April 6, 1967 |
| Term End: | April 3, 1973 |
| Birth Date: | 3 April 1898 |
| Birth Place: | Wainfleet, Ontario |
| Party: | Liberal |
Mary Elizabeth Kinnear (April 3, 1898 - December 24, 1991) was a Canadian senator.
Born in Wainfleet, Ontario, she was president of the National Federation of Liberal Women from 1959 to 1963. She was appointed to the Senate by Prime Minister Lester Pearson in 1967 representing the senatorial division of Welland, Ontario. A Liberal, she retired in 1973 on her 75th birthday.