SM U-29 was a Type U-27 U-boat of the Imperial German Navy. She served during the First World War.

U-29s last commander was Kapitänleutnant Otto Weddigen. U-29 was sunk with all hands on 18 March 1915 in the Pentland Firth after being rammed by , the only submarine known to have been purposely sunk by a battleship.

Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate11 March 1915Adenwen3,798Damaged11 March 1915Auguste Conseil2,952Sunk12 March 1915Andalusian2,349Sunk12 March 1915Headlands2,988Sunk12 March 1915Indian City4,645Sunk14 March 1915Atalanta519Damaged

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