| Birth date | 26 August 1889 |
|---|---|
| Birth place | Oro, Ontario |
| Death date | 17 August 1950 (aged 60) |
| Riding 1 | Simcoe North |
| Predecessor 1 | John Thomas Simpson |
| Successor 1 | Julian Ferguson |
| Term start 1 | 1935 |
| Term end 1 | 1945 |
| Office 2 | Mayor of Barrie, Ontario |
| Predecessor 2 | Walter Duff |
| Successor 2 | John Craig |
| Term start 2 | 1928 |
| Term end 2 | 1931 |
| Profession | lawyer |
| Party | Liberal |
Duncan Fletcher McCuaig (August 26, 1889 – August 17, 1950) was a Canadian politician who served in the House of Commons from 1935 to 1945, representing the electoral district of Simcoe North as a member of the Liberal Party. He had previously served as mayor of Barrie, Ontario from 1928 to 1931.
His daughter Janice later served for twelve years as mayor of Barrie, and herself mounted an unsuccessful campaign for election to the House of Commons in 1993.