The Western Dry Dock and Shipbuilding Company was a shipyard that operated at Port Arthur, Ontario, now part of Thunder Bay, on Lake Superior from 1911 to 1993. The shipyard was established in 1909 and renamed in 1916 as the Port Arthur Shipbuilding Company. The yard closed in 1993. It reopened as a repair yard Lakehead Marine and Industrial, however that venture failed in 2014. As of 2016, the shipyard was purchased by Heddle Marine. It is operated by Heddle Marine in partnership with Fabmar Metals Inc, of Thunder Bay. The venture focuses on ship repair services and winter layup options.

HMCS Cobalt was a Flower-class corvette of the Royal Canadian Navy which took part in convoy escort duties during the Second World War. She served primarily in the Battle of the Atlantic. She was named for Cobalt, Ontario.