Two ships of the German Imperial Navy were named SMS S51. They were both torpedo boats built by Schichau-Werke.
- torpedo boat launched by Schichau on 28 November 1889. Renamed T51 in 1910. Mined and sunk 29 May 1915. - "large"- or "high-seas"-torpedo boat, launched by Schichau on 29 April 1915. Scuttled at Scapa Flow on 21 June 1919.
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