Yes, "Hallelujah" is a Christmas song. It was originally released in 1984 by American singer and songwriter Leonard Cohen, and it has since become a popular Christmas classic. Many artists have recorded their own versions of the song over the years, including Bob Dylan, John Cale, Rufus Wainwright, and many more. The lyrics of the song are often interpreted as a celebration of the birth of Jesus, and the melody and overall mood of the song is uplifting and festive, making it a perfect choice for the holiday season.