Diphilus, of Sinope, was a poet of the new Attic comedy and a contemporary of Menander. He is frequently listed together with Menander and Philemon, considered the three greatest poets of New Comedy. He was victorious at least three times at the Lenaia, placing him third before Philemon and Menander. Although most of his plays were written and acted at Athens he died at Smyrna. His body was returned and buried in Athens.

Sinop, historically known as Sinope, is a city on the isthmus of İnce Burun and on the Boztepe Peninsula, near Cape Sinope which is situated on the northernmost edge of the Turkish side of the Black Sea coast, in the ancient region of Paphlagonia, in modern-day northern Turkey. It is the seat of Sinop Province and Sinop District. Its population is 57,404 (2022).