Christmas dinner is a meal traditionally eaten at Christmas. This meal can take place any time from the evening of Christmas Eve to the evening of Christmas Day itself. The meals are often particularly rich and substantial, in the tradition of the Christian feast day celebration, and form a significant part of gatherings held to celebrate the arrival of Christmastide. In many cases, there is a ritual element to the meal related to the religious celebration, such as the saying of grace.

The actual meal consumed varies in different parts of the world with regional cuisines and local traditions. In many parts of the world, particularly former British colonies, the meal shares some connection with the English Christmas dinner involving roasted meats and pudding of some description. The Christmas pudding and Christmas cake evolved from this tradition.

In countries without a lengthy Christian tradition, the Christmas meal may be more heavily influenced by popular culture. An example of this is Japan, where a KFC takeaway meal is traditionally consumed.