Saint Patrick's DaySaint Patrick's Day 2004 in Cork, IrelandSaint Patrick's Day (Irish: Lá Fhéile Pádraig, Scottish Gaelic: Là Fhèill Pàdraig) is a yearly holiday celebrated on 17 March. It is named after Saint Patrick (circa AD 387–461), the most commonly recognized of the patron saints of Ireland. It began as a purely Christian holiday and became an official feast day in the early 1600s. However, it has gradually become more of a secular celebration of Ireland's culture.

It is a public holiday on the island of Ireland; including Northern Ireland and the Republic of Ireland, as well as in Newfoundland and Labrador and in Montserrat. It is also widely celebrated by the Irish diaspora, especially in places such as Great Britain, Canada, the United States, Argentina, Australia, New Zealand, and Montserrat, among others.