Mamert Stankiewicz (January 22, 1889 – November 26, 1939) was a Polish naval officer of the merchant marine, the commander of Lwów, SS Polonia and finally the ocean liner MS Piłsudski. During the opening months of World War II he was salvaged from one of the latter ship's boats and died of hypothermia. Stankiewicz's life was immortalized by Karol Olgierd Borchardt, whose series of books on Stankiewicz became a best-seller among Polish maritime books.