Panteleius was an ancient Greek epic poet. His exact dates are uncertain, but he likely lived during the Classical period, in the 5th or 4th century BCE. He is known only as the name associated with a single, lost epic poem.

He is credited with composing a Thebais, an epic about the myth of the Seven against Thebes. However, the work does not survive, and its authorship was disputed even in antiquity. The main source that mentions Panteleius, the Suda lexicon, states that many considered this same Thebais to be the work of the more famous poet Antimachus of Colophon. According to modern scholars, Panteleius is a shadowy figure who seems to have existed primarily as an alternative candidate in ancient debates about who wrote certain poems.

Panteleius holds minimal independent historical significance. He left no known body of work and had no attested influence on later literature. His importance lies only in illustrating how ancient scholars sometimes attributed works to multiple possible authors, with some names, like Panteleius's, remaining otherwise completely unknown.