Paradise Lost by John Milton is an epic poem in blank verse by the 17th-century English poet John Milton (1608–1674). The first version, published in 1667, consists of ten books with over ten thousand lines of verse. A second edition followed in 1674, arranged into twelve books (in the manner of Virgil's Aeneid) with minor revisions throughout.

It is considered to be Milton's masterpiece, and it helped solidify his reputation as one of the greatest English poets of all time. The poem concerns the biblical story of the Fall of Man: the temptation of Adam and Eve by the fallen angel Satan and their expulsion from the Garden of Eden.

The poem follows the epic tradition of starting in medias res (in the midst of things), the background story being recounted later.

Milton's story has two narrative arcs, one about Satan (Lucifer) and the other, Adam and Eve. It begins after Satan and the other fallen angels have been defeated and banished to Hell, or, as it is also called in the poem, Tartarus. In Pandæmonium, the capital city of Hell, Satan employs his rhetorical skill to organise his followers; he is aided by Mammon and Beelzebub.

Belial and Moloch are also present. At the end of the debate, Satan volunteers to corrupt the newly created Earth and God's new and most favoured creation, Mankind. He braves the dangers of the Abyss alone, in a manner reminiscent of Odysseus or Aeneas. After an arduous traversal of the Chaos outside Hell, he enters God's new material World, and later the Garden of Eden.