"Silent Night" is a popular Christmas carol, composed in 1818 by Franz Xaver Gruber to lyrics by Joseph Mohr in Oberndorf bei Salzburg, Austria. It was declared an intangible cultural heritage by UNESCO in 2011. The song was first recorded in 1905 and has remained a popular success, appearing in films and multiple successful recordings, as well as being quoted in other musical compositions. It is the world's most recorded Christmas song, with more than 137,000 known recordings.

A Christmas carol is a carol on the theme of Christmas, traditionally sung at Christmas itself or during the surrounding Christmas holiday season. The term noel has sometimes been used, especially for carols of French origin. Christmas carols may be regarded as a subset of the broader category of Christmas music.