The Nereide was a Nautilus-class submarine in the Italian Royal Navy during World War I. The Italian Nautilus was designed by Curio Bernardis, later a well-known submarine designer. Nereide's hull, like that of her sister ship Nautilus, was shaped similar to a torpedo boat. She was 40.94 m long with a beam of 4.29 m and a draft of 2.84 m.
She was built 1911–1913 at the navy yard at Venice and was sunk in 1915 by the Austro-Hungarian submarine U-5 under the command of Georg Ritter von Trapp.
