Halloween is a holiday observed on October 31, primarily in regions of the Western world. The festival has its roots in Ireland, and was popularized after Irish immigrants brought it to the United States in 1846. Halloween is significant cultural event in Ireland where it is widely celebrated.

It is known in Irish as Oíche Shamhna (pronounced ee-hah how-nah), literally "Samhain Night." In the Irish language, Samhain is the name for the month of November. Pre-Christian Celts had an autumn festival, Samhain (pronounced /ˈsˠaunʲ/from the Old Irish ˈˈsamainˈˈ), "End of Summer," a pastoral and agricultural "fire festival" or feast, when the dead revisited the mortal world and large communal bonfires would hence be lit to ward off evil spirits. Costumes and masks historically also worn at the festivals in an attempt to copy the evil spirits or placate them.

Pope Gregory IV standardized the date of All Saints' Day, or All Hallows' Day, on November 1 in the name of the entire Western Church in 837. As the Church day began at sunset, the holiday coincided exactly with Samhain. It is claimed that the choice of date was consistent with the common practice of leaving pagan festivals and buildings intact (e.g., the Pantheon) while overlaying a Christian meaning, however no reliable documentation indicates such a motivation in this case.

While the Celts might have been content to move All Saints' Day from their own previous date of April 20, the rest of the world celebrating it on May 13, it is speculated without evidence that they were unwilling to give up their preexisting autumn festival of the dead and continued to celebrate Samhain.

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