SMS S23 refers to two torpedo boats built by the German (Imperial Navy):

, a launched on 10 October 1885, and sold in 1905. , a launched in 1913, renamed T23 in 1932, again renamed T123 in 1939, and converted to control ship for radio-controlled target ships in 1939, being renamed Komet. Ceded to the Soviet Union in 1946.

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