John Sandfield Macdonald

The Honourable John Sandfield Macdonald QC
Macdonald, c. 1870
1st Premier of Ontario
In office July 16, 1867 – December 20, 1871
Monarch	Victoria
Lieutenant Governor	Henry William Stisted William Pearce Howland
Preceded by	Position established
Succeeded by	Edward Blake
Joint Premier of the Province of Canada
In office May 24, 1862 – March 29, 1864
Governor General	Viscount Monck
Preceded by	John A. Macdonald
Succeeded by	John A. Macdonald
Member of the Legislative Assembly of the Province of Canada for Glengarry
In office 1841–1844
Preceded by	Position established
Personal details
Born	(1812-12-12)December 12, 1812 St. Raphael West, Glengarry County, Upper Canada
Died	June 1, 1872(1872-06-01) (aged 59) Cornwall, Ontario, Canada
Resting place	St. Andrews Cemetery, South Stormont, Ontario
Political party	Liberal-Conservative
Spouse	Marie Christine Waggaman
Relatives	Donald Alexander Macdonald and Alexander Francis Macdonald
Signature
Military service
Allegiance	Upper Canada
Branch/service	Canadian militia
Years of service	1830s–1852
Rank	Lieutenant Lieutenant-Colonel
Unit	Queen's Light Infantry Militia (Toronto) Glengarry Militia Regiment of the Eastern District
Commands	4th Battalion, Glengarry Militia

John Sandfield Macdonald, QC (December 12, 1812 – June 1, 1872) was the joint premier of the Province of Canada from 1862 to 1864. He was also the first premier of Ontario from 1867 to 1871, one of the four founding provinces created at Confederation in 1867. He served as both premier and attorney general of Ontario from July 16, 1867, to December 20, 1871.

He was referred to by his middle name, Sandfield, and often signed his correspondence and documents as J. Sandfield Macdonald.