圣诞树是圣诞节庆祝中最有名的传统之一。通常人们在圣诞前后把一棵常绿植物如松树弄进屋里或者在户外，并用圣诞灯和彩色的装饰物装饰。并把一个天使或星星放在树的顶上。

就像圣诞起源于异教的习俗，圣诞树也有悠远的历史，并成为很多文化中冬季的普遍现象。

圣诞树一般解释为古代异教的主张在基督教化保留下来，常绿树象征庆祝生命复苏。

古罗马镶嵌画显示，酒神狄俄尼索斯凯旋自印度，拿着一个针叶树的枝条。基督教化进程也可以在古英语诗十字架之梦（Dream of the rood）中得到印证，在诗中树就是耶稣受刑的刑具。这首诗也引用创世记中记载的辨识善恶树。

A Christmas tree is a decorated tree, usually an evergreen conifer such as spruce, pine, or fir or an artificial tree of similar appearance, associated with the celebration of Christmas. Originally a Celtic custom, the Christmas tree developed in early modern Germany (where it is today called Weihnachtsbaum or Christbaum) with predecessors that can be traced to the 16th and possibly 15th century, in which devout Christians brought decorated trees into their homes. It acquired popularity beyond Germany during the second half of the 19th century, at first among the upper classes.