HMS H41 was a British H class submarine built by Armstrong Whitworth, Newcastle Upon Tyne, England.

The submarine was moored in a dock basin at Blyth (NZ319816), a few yards from the 6,620 ton depot ship Vulcan.

The ex-cruiser was in harbour for repairs to her main engines and during the afternoon she built up a head of steam and began to carry out a slow-speed trial.

In the restricted waters of the dock basin the suction from the depot-ship's propellers drew the submarine towards her and, despite the efforts of both crews to keep the two vessels apart, Vulcan's screws struck the stern of the submarine, cut through her outer casing and sliced open the pressure hull.

This article about a specific naval submarine of the United Kingdom is a stub.