| John Angus McMillan | |
| Riding1: | Glengarry |
| Parliament1: | Canadian |
| Term Start1: | 1908 |
| Term End1: | 1917 |
| Predecessor1: | Jacob Thomas Schell |
| Successor1: | Archibald John Macdonald |
| Office2: | Ontario MPP |
| Term Start2: | 1905 |
| Term End2: | 1908 |
| Predecessor2: | William Duncan McLeod |
| Successor2: | Donald Robert McDonald |
| Constituency2: | Glengarry |
| Party: | Liberal |
| Birth Date: | 11 June 1874 |
| Birth Place: | Alexandria, Ontario, Canada |
| Occupation: | Merchant |
John Angus McMillan (June 11, 1874 - December 23, 1922) was an Ontario merchant and political figure. He represented Glengarry in the Legislative Assembly of Ontario from 1905 to 1908 and in the House of Commons of Canada from 1908 to 1917 as a Liberal member.
He was born in Alexandria, Ontario, the son of Duncan McMillan, and grew up there. McMillan served on the town council for Alexandria. He was an agent for a furniture and appliance manufacturer. In 1906, he married Flora McDonald.[1]