The Second Battle of Heligoland Bight, also the Action in the Helgoland Bight and the Zweite Seeschlacht bei Helgoland, was an inconclusive naval engagement fought between British and German squadrons on 17 November 1917 during the First World War.

Hans Hermann Ludwig von Reuter was a German admiral who commanded the High Seas Fleet when it was interned at Scapa Flow in the north of Scotland at the end of World War I. On 21 June 1919 he ordered the scuttling of the German fleet in Scapa Flow to prevent the UK from seizing the ships.