A Christmas decoration is any of several types of ornamentation used at Christmastide and the greater holiday season. The traditional colors of Christmas are pine green (evergreen), snow white, and heart red. Gold and silver are also prevalent, as are other metallic colours. Typical images on Christmas decorations include Baby Jesus, Mother Mary, angels, Father Christmas, Santa Claus, and the star of Bethlehem. Advent wreaths, nativity scenes, illuminations, and Moravian stars are popular Christmas decorations.

The hanging of the greens is a Western Christian ceremony in which many congregations and people adorn their churches, as well as other buildings, with Advent and Christmas decorations. This is done on or directly before the start of the Advent season, in preparation for Christmastide. The service involves the placement of evergreen vegetation in the parish. Items such as the evergreen wreath, in Christianity, carry the religious symbolism of everlasting life, a theological concept within that faith. As such, during the liturgy, "Biblical passages and other readings help explain the significance of the holly, the cedar, the Advent wreath, the Chrismon tree, and any other special decorations". Christmas trees are frequently erected during the hanging of the greens, although they are sometimes left bare until Christmas Eve.