List of the largest ships hit by U-boats in World War I

During the First World War, U-boats of the German Imperial Navy (German: Kaiserliche Marine) and the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u.K. Kriegsmarine) sank over 6,000 Allied and neutral ships totaling over 14,200,000 tons.^[1] Many additional ships that are not included in those totals were damaged, but were able to return to service after repairs. This list contains the approximately 100 ships over 10,000 tons that were either damaged or sunk by U-boats by torpedoes, submarine-laid mines, gunfire, or other means.^{[Note 1]}

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