Wren Day (Irish: Lá an Dreoilín), or Hunt the Wren Day (Manx: Shelg yn Dreean), is an Irish and Manx custom on 26 December, Saint Stephen's Day (known in most of Ulster as Boxing Day). Traditionally, men and boys hunted a wren, which was revered as the 'king of the birds'. They displayed it on top of a staff decorated with holly, ivy and ribbons, or in a decorated box on top of a pole. This was paraded around the neighbourhood by a group of 'Wrenboys'—typically dressed in straw masks, greenery and colourful motley clothing—who sang songs and played music in exchange for donations. This was meant to ensure prosperity for the coming year. Afterwards, the wren was buried. On the Isle of Man, they held a funeral for the wren and danced around a 'wren pole'.
There were similar New Year traditions in parts of western Britain and France until the nineteenth century. There are several folk tales about the origin of the wren hunt. It is speculated that the tradition derives from ancient Celtic paganism and was originally a sacrifice associated with the winter solstice. In most places, Wren Day gradually died out following industrialisation, but it has been undergoing a revival since the late 20th century. Today, the wren is no longer hunted, and a mock or stuffed wren is used instead. It is especially popular on the Isle of Man and in Kerry.