A tree-topper or treetopper is a decorative ornament placed on the top (or "crown") of a Christmas tree or Chrismon tree. Tree-toppers come in many forms, with the most common being a star (representing the Star of Bethlehem) or an angel (representing the Angel Gabriel), both from the Nativity. Additional forms range from a Christian cross, white dove, paper rosette, ribbon bow, Father Christmas or Santa Claus.
Tree-toppers may be made of a wide range of materials. Modern plastic tree-toppers are often electric and, once connected with the tree's lights, offer a gentle glow. Following World War II, various symbols of Christmastide, such as stars, were introduced as electrified tree-toppers. The tradition of using a symbol representing the Star of Bethlehem as a tree-topper, however, dates as early as the 1840s.