Darvel Bay or Lahad Datu Bay is a bight (large bay) on the east side of Sabah on the island of Borneo. It is the largest semi-enclosed bay on the east coast of Borneo and faces the Sulawesi Sea. Administratively, it is within Tawau Division, with Lahad Datu District on the north side, Kunak District in the middle and Semporna District to the south of the bay.