Duncan McDonald (May 15, 1839 – 1903) was a merchant and political figure in Nova Scotia. He represented Victoria in the Canadian House of Commons from 1878 to 1882 as a Liberal member.
He was born in Harris, Scotland. In 1869, he married Jessie Agnes N. Brown.
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| Preceded by Charles James Campbell |
Member of Parliament from Victoria, Nova Scotia 1878–1882 |
Succeeded by Charles James Campbell |