See also: 1839 in Canada, other events of 1840, 1841 in Canada and the list of 'years in Canada'.

Events

• May 6 - Postage stamps come into use.
• June 10 - Queen Victoria and Prince Albert are shot at.
• June 28 - Queen Victoria is crowned.
• July 23 - Act of Union. The Queen sanctions the union of Upper and Lower Canada. The United Canada Act allows larger government to borrow more money.

Births

• January 1 - John Christian Schultz, politician
• February 19 - William LeSueur, historian
• June 25 - John Murray, detective
• September 26 - Louis-Olivier Taillon, Premier of Quebec
• October 9 - Robert Drummond, labour union
• October 15 - Honoré Mercier, Premier of Quebec
• November 6 - James Fisher, Manitoba politician
• November 9 - Joseph-Adolphe Chapleau, Premier of Quebec
• November 14 - May Fleming, author

Deaths

• April 19 - Jean-Jacques Lartigue, bishop