Catholic Church in Ireland
In the 2016 Irish census 78.3% of the population identified as Catholic in Ireland; numbering approximately 3.7 million people. Unlike Catholics in the United States, Ireland has seen a significant decline from the 84.2% who identified as Catholic in the 2011 census.
Irish diaspora
Central to the Irish community in Britain was the community's relationship with the Roman Catholic Church, with which it maintained a strong sense of identity. The Church remains a crucial focus of communal life among some of the immigrant population and their descendants. The largest ethnic group among the Roman Catholic priesthood of Britain remains Irish (in the United States, the upper ranks of the Church's hierarchy are of predominantly Irish descent.) The former head of the Roman Catholic Church in Scotland is Cardinal Keith O'Brien.