Nativity scene in the context of "Carnegie Museum of Art"

Christian tradition is a collection of traditions consisting of practices or beliefs associated with Christianity. Many churches have traditional practices, such as particular patterns of worship or rites, that developed over time. Deviations from such patterns are sometimes considered unacceptable by followers, or are regarded as heretical. There are certain Christian traditions that are practiced throughout the liturgical year, such as praying a daily devotional during Advent, erecting a nativity scene during Christmastide, chalking the door on Epiphany Day, fasting during Lent, waving palms on Palm Sunday, eating easter eggs during Eastertide, and decorating the church in red on Pentecost.

Tradition also includes historic teaching of the recognized church authorities, such as Church Councils and ecclesiastical officials (e.g., the Pope, Patriarch of Constantinople, Archbishop of Canterbury, etc.), and includes the teaching of significant individuals like the Church Fathers, the Protestant Reformers, and the founders of denominations. Many creeds, confessions of faith, and catechisms generated by these bodies are also part of the traditions of various bodies.

A Christmas decoration is any of several types of ornamentation used at Christmas and the greater Christmas and holiday season. Typical images on Christmas decorations include Baby Jesus, Mother Mary, angels, Father Christmas, Santa Claus, and the star of Bethlehem. Advent wreaths, nativity scenes, illuminations, and Moravian stars are popular Christmas decorations.

In many countries, such as Sweden, people start to set up their Advent and Christmas decorations on the first day of Advent. Liturgically, this is done in some parishes through a Hanging of the Greens ceremony. In the Western Christian world, the two traditional days when Christmas decorations are removed are Twelfth Night and if they are not taken down on that day, Candlemas, the latter of which ends the Christmas-Epiphany season in some denominations. Taking down Christmas decorations before Twelfth Night, as well as leaving the decorations up beyond Candlemas, is historically considered to be inauspicious.

The observance of Christmas around the world varies by country and by religion. The day of Christmas, and in some cases the day before and the day after, are recognized by many national governments and cultures worldwide, including in areas where Christianity is a minority religion which are usually found in Africa and Asia. In some non-Christian areas, periods of former colonial rule introduced the celebration (e.g. Hong Kong); in others, Christian minorities or foreign cultural influences have led populations to observe the holiday.

Christmas traditions for many nations include the installing and lighting of Christmas trees, the hanging of Advent wreaths, Christmas stockings, candy canes, setting out cookies and milk, the creation of Nativity scenes depicting the birth of Jesus Christ and giving gifts to others. Christmas carols may be sung and stories told about such figures as the Baby Jesus, Saint Nicholas, Santa Claus, Father Christmas, Christkind or Grandfather Frost. The sending and exchange of Christmas card greetings, observance of fasting and special religious observances such as a midnight Mass or Vespers on Christmas Eve, the burning of a Yule log, and the giving and receiving of presents are also common practice. Along with Easter, Christmas is one of the most important periods on the Christian calendar, and is often closely connected to other holidays at this time of year, such as Advent, the Feast of the Immaculate Conception, Saint Nicholas Day, Saint Stephen's Day, New Year's, and the Feast of the Epiphany.

Christmastide, also known as Christide, is a season of the liturgical year in most Christian churches.

For the Catholic Church, Lutheran Church, Anglican Church, Methodist Church and some Orthodox Churches, Christmastide begins on 24 December at sunset or Vespers, which is liturgicus the beginning of Christmas Day. Most of 24 December is thus not part of Christmastide, but of Advent, the season in the Church Year that precedes Christmastide. In many liturgical calendars Christmastide is followed by the closely related season of Epiphanytide that commences at sunset on 5 January—a date known as Twelfth Night.

Christmas in Italy (Italian: Natale, pronounced [naˈtaːle]) begins on 8 December, with the Feast of the Immaculate Conception, the day on which traditionally the Christmas tree is mounted and ends on 6 January, of the following year with the Epiphany (Italian: Epifania [epifaˈniːa]), and in some areas female puppets are burned on a pyre (called falò), to symbolize, along with the end of the Christmas period, the death of the old year and the beginning of a new one. 26 December (Saint Stephen's Day, in Italian Giorno di Santo Stefano), is also a public holiday in Italy. The Italian term Natale derives from the Latin natalis, which literally means 'birth', and the greetings in Italian are buon Natale (Merry Christmas) and felice Natale (lit. 'happy Christmas').

The tradition of the nativity scene comes from Italy. One of the earliest representation in art of the nativity was found in the early Christian Roman catacomb of Saint Valentine. The first seasonal nativity scene, which seems to have been a dramatic rather than sculptural rendition, is attributed to Saint Francis of Assisi (died 1226). Francis' 1223 nativity scene in Greccio is commemorated on the calendars of the Catholic, Lutheran and Anglican liturgical calendars, and its creation is described by Saint Bonaventure in his Life of Saint Francis of Assisi c. 1260. Nativity scenes were popularised by Saint Francis of Assisi from 1223, quickly spreading across Europe. It seems that the first Christmas tree in Italy was erected at the Quirinal Palace at the behest of Queen Margherita, towards the end of the 19th century. Mount Ingino Christmas Tree in Gubbio is the tallest Christmas tree in the world. In Italy, the oldest Christmas market is considered to be that of Bologna, held for the first time in the 18th century and linked to the feast of Saint Lucy. Typical bearers of gifts from the Christmas period in Italy are Saint Lucy (December 13), Christ Child, Babbo Natale (the name given to Santa Claus), and, on Epiphany, the Befana.

An Advent calendar, from the German word Adventskalender, is used to count the days of Advent in anticipation of Christmas. Since the date of the First Sunday of Advent varies, falling between November 27 and December 3 inclusive, many reusable Advent calendars made of paper or wood begin on December 1. Others start from the First Sunday of Advent.

The Advent calendar was first used by German Lutherans in the 19th and 20th centuries, and has since then spread to other denominations.