is a marine transportation company based in Sado, Niigata, Japan, it was founded as Sado Shosen on February 3, 1913. In 1932, the modern version of the company was established through the merger of three ferry companies; Sado Shosen, Etsusa Shosen and Niigata Kisen into Sado Kisen as a joint public-private venture. This was the first example of this kind of joint public-private venture in Japan. On March 31, 2022, 66.54% of this company's shares were transferred to Michinori Holdings, transferring overall ownership to that company.
Sado Steam Ship provide two regular timetabled services between Niigata Prefecture and Sado Island.
Sado Steam Ship operates from six terminals.
, the following ships are in service.