A Christmas card is a greeting card sent as part of the traditional celebration of Christmas in order to convey between people a range of sentiments related to Christmastide and the holiday season. Christmas cards are usually exchanged during the weeks preceding Christmas Day by many people in Western society and in Asia. The traditional greeting reads "wishing you a Merry Christmas and a Happy New Year". There are innumerable variations on this greeting, many cards expressing more religious sentiment, or containing a poem, prayer, Christmas song lyrics or Biblical verse; others focus on the general holiday season with an all-inclusive "Season's greetings". The first modern Christmas card was by John Calcott Horsley.

A greeting card is a piece of card stock, usually with an illustration or photo, made of high quality paper featuring an expression of friendship or other sentiment. Although greeting cards are usually given on special occasions such as birthdays, Christmas or other holidays, such as Halloween, they are also sent to convey thanks or express other feelings.