SS Shinyō Maru was a Japanese cargo-steamer and hellship sunk during the Second World War. She was originally named the SS Clan Mackay and was built by the Naval Construction & Armaments Company, Barrow-in-Furness for the Clan Line. She sailed with them until sold in 1913 to the Adelaide Steamship Company, which renamed her Ceduna. She was then sold, in 1924, to a company in Shanghai which renamed her Tung Tuck. In 1937, she was renamed Chang Teh, and was sold to Greece later that year. She sailed for her new owners under the name Pananis, until seized by the Japanese at Shanghai in 1941 and renamed Shinyō Maru.