In most Christian denominations, a fallen angel is an angel who has been exiled or banished from Heaven. Often such banishment is a punishment for disobeying or rebelling against God (see War in Heaven). The best-known fallen angel is Lucifer.

Lucifer is a name frequently given to Satan in Christian belief. This usage stems from a particular interpretation, as a reference to a fallen angel, of a passage in the Bible (Isaiah 14:3-20) that speaks of someone who is given the name of "Day Star" or "Morning Star" (in Latin, Lucifer) as fallen from heaven. The Greek etymological synonym of Lucifer, Εωσφόρος (Eosphoros, "light-bearer") is used of the morning star in 2 Peter 1:19 and elsewhere with no relation to Satan.

But Satan is called Lucifer in many writings later than the Bible, notably in Milton's Paradise Lost (7.131-134, among others), because, according to Milton, Satan was "brighter once amidst the host of Angels, than that star the stars among." According to the Catechism of the Catholic Church, angels were all created good but some turned bad on their own. Angels don't need faith as they already have the knowledge of celestial things, so their rebellion against God constituted unforgivable sin. Matthew 12:32 qualifies unforgivable sin as being unforgivable in "this age or the age to come." Although most Christians do not interpret this to mean that those who have committed this sin may be redeemed after the passage of two ages, a tradition stretching back as far as Gregory of Nyssa and Origen has taught that the devil and fallen angels will eventually be saved.

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