"Christmas Canon" is a Christmas song by the Trans-Siberian Orchestra from their 1998 album The Christmas Attic. It often ranks on the iTunes Top 100 Chart at Christmas time.
The song is set to the tune of Johann Pachelbel's Canon in D Major with new lyrics added. The style is a departure from TSO's usual rock arrangements, instead being performed in the style of a children's choir with light accompaniment from piano and strings. The group's rock version is entitled "Christmas Canon Rock", which debuted on their 2004 album The Lost Christmas Eve.
As of December 2010, the song serves as the third best-selling holiday song in digital history with 701,000 downloads.