Christian mythology is the body of myths associated with Christianity. Christian mythology has been examined by scholars in the fields of comparitive mythology, theology and literary studies. The term encompasses a broad variety of legends and narratives, especially those considered sacred narratives. Mythological themes and elements occur throughout Christian literature, including recurring myths such as ascending a mountain, the axis mundi, myths of combat, descent into the Underworld, accounts of a dying-and-rising god, a flood myth, stories about the founding of a tribe or city, and myths about great heroes (or saints) of the past, paradises, and self-sacrifice.

Various authors have also used it to refer to other mythological and allegorical elements found in the Bible, such as the story of the Leviathan. The term has been applied to myths and legends from the Middle Ages, such as the story of Saint George and the Dragon, the stories of King Arthur and his Knights of the Round Table, and the legends of the Parsival. Multiple commentators have classified John Milton's epic poem Paradise Lost as a work of Christian mythology. The term has also been applied to modern stories revolving around Christian themes and motifs, such as the writings of C. S. Lewis, J. R. R. Tolkien, Madeleine L'Engle, and George MacDonald.

Medieval Christian mythology also incorporated motifs from local European folklore and pre-Christian traditions. Elements of Christian mythology has influenced modern fantasy literature, visual art, music and popular culture.

Over the centuries, Christianity has divided into many denominations. Not all of these denominations hold the same set of sacred traditional narratives. For example, the books of the Bible accepted by the Roman Catholic Church and the Eastern Orthodox churches include a number of texts and stories (such as those narrated in the Book of Judith and Book of Tobit) that many Protestant denominations do not accept as canonical.

Christian theologian and professor of New Testament, Rudolf Bultmann wrote that:

The cosmology of the New Testament is essentially mythical in character. The world is viewed as a three storied structure, with the earth in the center, the heaven above, and the underworld beneath. Heaven is the abode of God and of celestial beings – the angels. The underworld is hell, the place of torment. Even the earth is more than the scene of natural, everyday events, of the trivial round and common task. It is the scene of the supernatural activity of God and his angels on the one hand, and of Satan and his demons on the other. These supernatural forces intervene in the course of nature and in all that men think and will and do. Miracles are by no means rare. Man is not in control of his own life. Evil spirits may take possession of him. Satan may inspire him with evil thoughts. Alternatively, God may inspire his thought and guide his purposes. He may grant him heavenly visions. He may allow him to hear his word of succor or demand. He may give him the supernatural power of his Spirit. History does not follow a smooth unbroken course; it is set in motion and controlled by these supernatural powers. This æon is held in bondage by Satan, sin, and death (for "powers" is precisely what they are), and hastens towards its end. That end will come very soon, and will take the form of a cosmic catastrophe. It will be inaugurated by the "woes" of the last time. Then the Judge will come from heaven, the dead will rise, the last judgment will take place, and men will enter into eternal salvation or damnation.

In its broadest academic sense, the word myth simply means a traditional story. However, many scholars restrict the term "myth" to sacred stories. Folklorists often go further, defining myths as "tales believed as true, usually sacred, set in the distant past or other worlds or parts of the world, and with extra-human, inhuman, or heroic characters".

In classical Greek, muthos, from which the English word myth derives, meant "story, narrative." By the time of Christ, muthos had started to take on the connotations of "fable, fiction," and early Christian writers often avoided calling a story from canonical scripture a "myth". Paul warned Timothy to have nothing to do with "godless and silly myths" (bebēthous kai graōdeis muthous). This negative meaning of "myth" passed into popular usage. Some modern Christian scholars and writers have attempted to rehabilitate the term "myth" outside academia, describing stories in canonical scripture (especially the Christ story) as "true myth"; examples include C. S. Lewis and Andrew Greeley. Several modern Christian writers, such as C. S. Lewis, have described elements of Christianity, particularly the story of Christ, as "myth" which is also "true" ("true myth"). Others object to associating Christianity with "myth" for a variety of reasons: the association of the term "myth" with polytheism, the use of the term "myth" to indicate falsehood or non-historicity, and the lack of an agreed-upon definition of "myth". As examples of Biblical myths, Every cites the creation account in Genesis 1 and 2 and the story of Eve's temptation.