Saint Patrick’s Day (Irish: Lá ‘le Pádraig or Lá Fhéile Pádraig), colloquially is the feast day which annually celebrates Saint Patrick (386-493), the patron saint of Ireland, on March 17.
It is a national holiday in the Republic of Ireland (a bank holiday in Northern Ireland), celebrated around the world and will hopefully, someday, be a nationally celebrated holiday in the United States.
Quick Links to specific sections
General History of St. Patrick’s Day
History of St. Patrick’s Day in Ireland