John Angus MacMillan (27 March 1889 – 12 August 1956) was a Liberal party member of the House of Commons of Canada.
He became mayor of Wadena, Saskatchewan in 1917 and that same year was elected a Liberal member of the Legislative Assembly of Saskatchewan for the Wadena provincial riding.
[1] He was first elected to Parliament at the Mackenzie riding in a by-election on 23 October 1933, after two previous unsuccessful attempts there in 1925 and 1926.
MacMillan was re-elected in 1935 and served a complete term in the 18th Canadian Parliament.
In the 1945 election, MacMillan was defeated by Alexander Malcolm Nicholson of the Co-operative Commonwealth Federation.