HDMS Helgoland was a coast defence barbette ironclad bult for the Royal Danish Navy in the late 1870s.

The engines were rated at a total of 4,500 indicated horsepower (3,400 kW) and gave the ship a speed of 13.4 knots (24.8 km/h; 15.4 mph).

[3] Helgoland carried a maximum of 224 long tons (228 t) of coal that gave her a range of 1,400 nautical miles (2,600 km; 1,600 mi) at a speed of 9 knots (17 km/h; 10 mph).

The four single 22-caliber 260-millimeter (10.2 in) RBL guns were placed in the corners of the armored citadel in the hull.

[3] Helgoland, named for the 1864 Danish victory over the combined Prussian and Austro-Hungarian squadron at Battle of Heligoland during the Second Schleswig War,[4] was laid down on 20 May 1875 by the Orlogsværftet in Copenhagen, launched on 9 May 1878 and commissioned on 20 August 1879.