A Christmas carol (also called a noël) is a carol (song or hymn) whose lyrics are on the theme of Christmas, or the winter season in general. They are traditionally sung in the period before and during Christmas. The tradition of Christmas carols hails back as far as the thirteenth century, although carols were originally communal songs sung during celebrations like harvest tide as well as Christmas. It was only later that carols began to be sung in church, and to be specifically associated with Christmas.

Traditional carols have a strong tune and consist of a verse and/or chorus for group singing. They are often based on medieval chord patterns, and it is this that gives them their uniquely characteristic musical sound.

Today carols are regularly sung at religious services, including Carol services. Some compositions have words which are clearly not of a religious theme, but are often still referred to as carols.

Secular songs such as "White Christmas" and "Blue Christmas" are clearly not Christmas carols, though they are also popular in the period before Christmas, and should therefore be considered to be Christmas songs.

Carols can be sung by individual singers, but are also often sung by larger groups, including professionally trained choirs. Most churches have special services at which carols are sung, generally combined with readings from scripture about the birth of Christ.

In England, and some other countries (i.e. Poland (kolędowanie) and Bulgaria (koledari)), there is a tradition of Christmas carolling (earlier known as wassailing), in which groups of singers travel from house to house, singing carols, for which they are often rewarded with money, mince pies, or a glass of an appropriate drink. Money collected in this way is normally given to charity.

In Australia, where it is the middle of summer at Christmas, there is a tradition of Carols by Candlelight concerts which are held outdoors at night in cities and towns during the weeks leading up to Christmas. In Melbourne, "Carols by Candlelight" is held each Christmas Eve. Performers at the concerts including opera singers and musical theatre performers and popular music singers. People in the audience hold lit candles and join in singing some of the carols in accompaniament with the celebrities.

Christmas carols can also be played on musical instruments, and another tradition is for brass bands, such as the Salvation Army brass bands, to play carols before Christmas.

Here's a partial list of the set of songs that is played continuously during the Christmas season:

Away In A Manger

Carol Of The Bells

Deck The Halls

God Rest Ye Merry Gentlemen

Jingle Bells

Joy To The World

Hark, The Herald Angels Sing

Have Yourself A Merry Little Christmas

I'll Be Home For Christmas

It Came Upon A Midnight Clear

Little Drummer Boy

Oh Come All Ye Faithful

Oh Holy Night

Oh, Little Town of Bethlehem

Oh Christmas Tree

Rudolph the Red-Nose Reindeer

Santa Claus Is Coming To Town

Silent Night

Silver Bells

The Christmas Song (Chestnuts Roasting On An Open Fire)

The First Noel

The Twelve Days of Christmas

We Wish You A Merry Christmas

What Child Is This?

White Christmas

Winter Wonderland