The two Suma-class cruisers (須磨型防護巡洋艦, Suma-gata bōgojun'yōkan) were protected cruisers operated by the Imperial Japanese Navy. While more lightly armed and armored than many of its contemporaries, their small size and relatively simple design facilitated their construction and their relatively high speed made them useful for many military operations. Both participated in combat during the Russo-Japanese War and World War I.