Carussa or Karoussa (Ancient Greek: Κάρουσσα), also spelt as Carusa or Karousa (Καροῦσα), also known as Polichnion, was a Greek trading place (emporium) on the Black Sea coast of ancient Paphlagonia, south of Sinope, and 150 stadia from it. It is also mentioned in the Periplus of Pseudo-Scylax as a Greek city; and by Pliny the Elder. It was a member of the Delian League as it appears in tribute lists of ancient Athens.
- Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 87, and directory notes accompanying.
- Arrian. Periplus Ponti Euxini. Vol. p. 15.
- Marcian of Heraclea, p. 73.
- Pliny. Naturalis Historia. Vol. 6.2.
- Mogens Herman Hansen & Thomas Heine Nielsen (2004). An inventory of archaic and classical poleis. New York: Oxford University Press. p. 958. ISBN 0-19-814099-1.
- Lund University. Digital Atlas of the Roman Empire.