Callistratia or Kallistratia (Ancient Greek: Καλλιστρατία) was a town on the Black Sea coast of ancient Paphlagonia, at a distance of 20 stadia east of Cape Carambis [Wikidata] (modern Kerempe Burnu). It was also called Marsilla or Marsylla, according to the anonymous Periplus.

Its site is tentatively located near Kışla in Asiatic Turkey.

 This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Callistratia". Dictionary of Greek and Roman Geography. London: John Murray.

42°00′11″N 33°24′20″E / 42.002968°N 33.405624°E / 42.002968; 33.405624