MS Saga Ruby is a cruise ship owned and operated by Saga Cruises. She was built as the combined ocean liner/cruise ship MS Vistafjord in 1973 by Swan Hunter Shipbuilders in the United Kingdom for the Norwegian America Line. In 1983 she was sold to Cunard Line, retaining her original name until 1999 when she was renamed MS Caronia. In 2004 she was sold to her current owners.