An epic is a lengthy narrative poem, ordinarily concerning a serious subject containing details of heroic deeds and events significant to a culture or nation. Oral poetry may qualify as an epic, and Albert Lord and Milman Parry have argued that classical epics were fundamentally an oral poetic form. Another type of epic poetry is epyllion (plural: epyllia), which is a brief narrative poem with a romantic or mythological theme. The term, which means 'little epic', came into use in the nineteenth century. It refers primarily to the erudite, shorter hexameter poems of the Hellenistic period and the similar works composed at Rome from the age of the neoterics; to a lesser degree, the term includes some poems of the English Renaissance, particularly those influenced by Ovid. The most famous example of classical epyllion is perhaps Catullus 64.

Some of the most famous examples of epic poetry include the Ramayana, Mahabharata, the Ancient Greek Iliad and the Odyssey, the Old English Beowulf, or the Portuguese Lusiads.