| John P. MacKay | |
| Parliament: | Ontario Provincial |
| Term Start: | October 6, 1937 |
| Term End: | June 30, 1943 |
| Predecessor: | Samuel Lawrence |
| Successor: | William Herbert Connor |
| Riding: | Hamilton East |
| Party: | Liberal |
John P. MacKay was a Canadian politician who was Liberal MPP for Hamilton East from 1937 to 1943.[1]