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.

Christmas is an annual festival commemorating the birth of Jesus Christ, observed primarily on December 25 as a religious and cultural celebration among billions of people around the world. A feast central to the liturgical year in Christianity, it follows the season of Advent or the Nativity Fast, and initiates the season of Christmastide, which historically in the West lasts twelve days and culminates on Twelfth Night. Christmas Day is a public holiday in many countries, is celebrated religiously by a majority of Christians, as well as culturally by many non-Christians, and forms an integral part of the holiday season surrounding it.