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The Flutto class were a large class of submarines built for the Italian Royal Navy during the Second World War.
The Fluttos were a development of the 600 Series of medium-sized, or seagoing, submarines. They were built to a partial double-hulled Bernardis design, influenced by war-time experience and construction adapted for mass construction. The Fluttos were good sea-boats with improved internal arrangements, hull strength, anti-aircraft armament and diving times. They are regarded as the best medium-displacement submarines built by Italy up to that time. A total of 48 submarines were ordered, in three series. The name Flutto means “wave”, and the Type I vessels were named for marine terms and sea-creatures. The Type II and Type III vessels all bore names of metals.