Quintus of Smyrna was a Greek epic poet who lived in the late Roman imperial period, most likely during the 4th century CE. Beyond his name and his origin in the city of Smyrna in Asia Minor, no reliable facts about his life are known. He is the author of a single surviving work, the Posthomerica (meaning "The Events After Homer").

This poem is a 14-book epic that continues the story of the Trojan War from where Homer’s Iliad ends, covering events like the deaths of Achilles and Ajax, the building of the Trojan Horse, and the final sack of Troy. According to modern scholars, Quintus composed this work to fill the major narrative gap between the Iliad and the Odyssey. In doing so, he became an important bridge to earlier traditions, systematically versifying stories from the now-lost poems of the Epic Cycle. His writing is a deliberate imitation of Homeric style and meter, but it also incorporates the rhetorical flourishes of his own late antique era.

Quintus of Smyrna holds a unique place in literary history. His Posthomerica is the only complete, large-scale epic in Greek that survives from antiquity which attempts to connect the Homeric narratives. As such, it is a crucial source for understanding how later generations preserved, adapted, and paid homage to the Homeric tradition.