Numenius of Heraclea was a Greek didactic poet of the early Hellenistic period in the 4th and 3rd centuries BCE. A native of Heraclea, his precise city of origin is unknown, and no further biographical details survive.

His only known work is the didactic epic Halieutica, a poem on fishing. The work survives only in fragments, preserved chiefly through later quotations by authors such as Athenaeus. Numenius is significant as an early Hellenistic exponent of technical didactic poetry composed in the Homeric epic meter. His Halieutica belongs to a literary tradition extending from Hesiod to Oppian, offering a poetic treatment of ichthyology and fishing techniques.