Nymphis of Heraclea Pontica was a historian from the Greek colony of Heraclea Pontica on the Black Sea, active in the early to mid-3rd century BCE. The son of Xenagoras, he was a friend of the Seleucid king Antiochus I Soter, indicating a figure of status with connections to the Hellenistic royal courts. His work reflects a local historiographical tradition centered on his native city and the wider Pontic region.

His major work was On Heraclea, a history of his city in at least thirteen books covering its foundation and subsequent history. This text survives only in fragments preserved by later authors like Athenaeus and Stephen of Byzantium.

Nymphis is significant as a representative of Hellenistic local history. His On Heraclea served as a crucial source for later historians, most notably Memnon of Heraclea, thereby shaping the later historical understanding of the city and its interactions with neighboring powers.