Irish Canadians are Canadian citizens who have full or partial Irish heritage including descendants who trace their ancestry to immigrants who originated in Ireland. 1.2 million Irish immigrants arrived from 1825 to 1970, and at least half of those in the period from 1831 to 1850. By 1867, they were the second largest ethnic group, and comprised 24% of Canada's population. The 1931 national census counted 1,230,000 Canadians of Irish descent, half of whom lived in Ontario. About one-third were Catholic in 1931 and two-thirds Protestant.

Canadians are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many of these connections exist and are collectively the source of their being Canadian.