| Duncan MacArthur | |
| Parliament: | Ontario Provincial |
| Term Start: | December 11, 1911 |
| Term End: | May 29, 1914 |
| Predecessor: | James William Doyle |
| Successor: | John Grieve |
| Riding: | Middlesex North |
| Party: | Conservative |
Duncan MacArthur was a Canadian politician from Ontario. He represented Middlesex North in the Legislative Assembly of Ontario from 1911 to 1914.[1]