Alexander Mackenzie, PC (January 28, 1822 – April 17, 1892), a building contractor and newspaper editor, was the second Prime Minister of Canada from November 7, 1873 to October 8, 1878.
He was born in Logierait, Perthshire, Scotland to Alexander Mackenzie Sr. and Mary Stewart Fleming. He was the third of ten children. At the age of 13, Mackenzie's father died, and he was forced to end his formal education in order to help support his family. At the age of 16 he apprenticed as a stonemason and by the age of 20 he had reached journeyman status in this field. Mackenzie immigrated to Canada in 1842 to seek a better life as well as to follow his sweetheart, Helen Neil. Shortly thereafter, he converted from Presbyterianism to Baptist beliefs. Mackenzie's faith was to link him to the increasingly influential temperance cause, particularly strong in Ontario where he lived, a constituency of which he was to represent in the Parliament of Canada.
Mackenzie married Helen Neil (1826–1852) in 1845 and with her had three children, with only one girl surviving infancy. In 1853, he married Jane Sym (1825–1893).