Slavery in Canada includes historical practices of enslavement practised by both the First Nations until the 19th century, and by colonists during the period of European colonization.

The Act Against Slavery was an anti-slavery law passed on July 9, 1793, in the second legislative session of Upper Canada, the colonial division of British North America that would eventually become Ontario. It banned the importation of slaves and mandated that children born henceforth to female slaves would be freed upon reaching the age of 25.