The Boadicea class was a two ship class of scout cruisers of the Royal Navy, consisting of HMS Bellona and HMS Boadicea. They were the first class to be fitted with turbine machinery, propulsion which became standard for all future cruisers . They were larger and heavier than the commercially designed pairs of the Adventure, Forward, Pathfinder and Sentinel classes yet carried less armour and weaponry. Deck protection was limited to a partial plating over the machinery spaces.