Sangarus or Sangaros () was a town of ancient Bithynia near the shore of the Propontis. In the 4th century, an early Christian sect, the Novatianists, held a synod here. Yitzhak ha-Sangari may have been a native.

Sangaros must be somewhere on the coast from Çınarcık/Yalova to Hersek Asiatic Turkey.

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