| Margaret Mary Macdonald | |
| Birth Date: | November 11, 1910 |
| Birth Place: | Halifax, Nova Scotia, Canada |
| Death Date: | February 3, 1968 |
| Office: | Member of Parliament for King's |
| Term Start: | 1961 |
| Term End: | 1963 |
| Predecessor: | John Augustine Macdonald |
| Successor: | John Mullally |
| Occupation: | teacher, secretary |
Margaret Mary Macdonald was a Canadian politician. On May 29, 1961 she became the first woman to represent Prince Edward Island in the House of Commons of Canada.[1]
She first won representation for the electoral district of King's at the House of Commons in a by-election in 1961, a seat vacated by the death of her husband John Augustine Macdonald.[2] Macdonald retained her seat in the 1962 federal election. She was defeated by Liberal John Mullally in the 1963 federal election.