J. R. R. Tolkien derived the characters, stories, places, and languages of Middle-earth from many sources, especially medieval ones. Tolkien and the classical world have been linked by scholars, and by Tolkien himself. The suggested influences include the pervasive classical themes of divine intervention and decline and fall in Middle-earth; the splendour of the Atlantis-like lost island kingdom of Númenor; the Troy-like fall of Gondolin; the Rome-like stone city of Minas Tirith in Gondor; magical rings with parallels to the One Ring; and the echoes of the tale of Lúthien and Beren with the myth of Orpheus descending to the underworld. Other possible connections have been suggested by scholars.

J. R. R. Tolkien's fantasy books on Middle-earth, especially The Lord of the Rings and The Silmarillion, drew on a wide array of influences including language, Christianity, mythology, archaeology, ancient and modern literature, and personal experience. He was inspired primarily by his profession, philology; his work centred on the study of Old English literature, especially Beowulf, and he acknowledged its importance to his writings.