V 304 Breslau was a German fishing trawler that was requisitioned in the Second World War by the Kriegsmarine for use as a vorpostenboot.

[1] Weser was built as yard number 462 by Seebeckwerft, Wesermünde, Germanay for the Hochseefischerei Bremerhaven.

[3] The Code Letters QVKM were allocated,[2] as was the fishing boat registration BX 178.

[4][5] Weser had been renamed Breslau by February 1939 and her port of registry was changed to Wesermünde.

On 17 September 1940, she was wrecked in a storm at the entrance to the Noordzeekanaal near IJmuiden, North Holland, Netherlands with the loss of four of her crew.