'DK' (i) was a British unrealised naval undertaking by Admiral Sir Charles Forbes’s Home Fleet to detach part of its strength for an offensive sweep against any German ships in the Kattegat (22/23 September 1939).

The British force was to have comprised the light cruisers Aurora, Glasgow, Sheffield and Southampton, together with the destroyers of the 7^th Destroyer Flotilla, and was abandoned after the destroyers Javelin and Jersey had collided.