HMS Nairana (/naɪˈrɑːnə/) was a passenger ferry that was requisitioned by the Royal Navy (RN) as a seaplane carrier in 1917. She was laid down in Scotland in 1914 as TSS Nairana for the Australian shipping line Huddart Parker, but construction was suspended after the outbreak of the First World War. Following resumption of work, the ship was launched in 1915, and converted to operate wheeled aircraft from her forward flying-off deck, as well as floatplanes that were lowered into the water. She saw service during the war with the Grand Fleet, and in 1918–19 supported the British intervention in the Russian Civil War.