| Ernest Nicholls McDonald | |
| Parliament: | Ontario Provincial |
| Term Start: | October 20, 1919 |
| Term End: | May 10, 1923 |
| Predecessor: | James Thompson |
| Successor: | Thomas Dalton Johnston |
| Riding: | Peterborough East |
| Party: | United Farmers |
Ernest Nicholls McDonald was a Canadian politician from Ontario. He represented Peterborough East in the Legislative Assembly of Ontario from 1919 to 1923.[1]