Ocean Rig UDW Inc. was an operator of semi-submersible oil platforms and underwater drillships and was based in Athens.

The company owned 2 semi-submersibles and 4 ultra deepwater drillships.

The company was majority owned by DryShips, controlled by George Economou.

[5][6] Effective January 1, 2018, Pankaj Khanna became President & CEO of the company.

[8] This article about a natural gas or petroleum-related company is a stub.