The Herluf Trolle class was a class of coastal defence ships of the Royal Danish Navy. The class comprised , and .
The ships of the class were long, had a beam of , a draught of , and had a displacement of 3,494 tons. The ships were equipped with 2 shaft reciprocating engines, which were rated at and produced a top speed of .
The ships had belt armour of and turret armour.
The main armament of the ships were two single gun turrets. Secondary armament included four single guns and ten single guns.
Herluf Trolle was laid down at the Copenhagen Navy Yard and launched on 1 January 1899. Olfert Fischer was also laid down at Copenhagen Navy Yard and was launched on 1 January 1902.