Daphnus or Daphnous was a town of ancient Bithynia, situated upon an island in a lake called Daphnusis near the Mysian Olympus. The lake Daphnusis is identified as that called Miletopolitis by other authors. The cult site, Apollon Daphnousios, which is near to the Akçapınar District of Nilüfer/Bursa may be related to this town.. Another possible relationship can be established with the city of Daphnousiae, which is mentioned in the Notitiae Episcopatuum 3 and whose location is unknown.