Vettor Pisani was the lead ship of her class of four submarines built for the Regia Marina during the late 1920s. She was named after Vettor Pisani, a Venetian admiral. The submarine played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
Domenico Millelire was one of four Balilla-class submarines built for the Regia Marina during the late 1920s.
Balilla was the lead ship of her class of four submarines built for the Regia Marina during the late 1920s.
Antonio Sciesa was one of four Balilla-class submarines built for the Regia Marina during the late 1920s. She played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
Foca was the lead ship of her class of three submarine minelayers built for the Regia Marina during the late 1930s.
Atropo was one of three Foca-class submarine minelayers built for the Regia Marina during the late 1930s.
Zoea was one of three Foca-class submarine minelayers built for the Regia Marina during the late 1930s.
Argo was the lead ship of her class of two submarines ordered by the Portuguese government, but taken over and completed for the Regia Marina during the 1930s.
Velella was one of a pair of submarines ordered by the Portuguese government, but taken over and completed for the Regia Marina during the 1930s.
The Settembrini class was a pair of submarines built for the Regia Marina during the late 1920s. They played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
The Bandiera-class submarines were built for the Regia Marina during the late 1920s. They played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
The Pisani-class submarines were built for the Regia Marina during the late 1920s. They played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
Fratelli Bandiera was the lead ship of her class of four submarines built for the Regia Marina during the late 1920s.
Luciano Manara was one of four Bandiera-class submarines built for the Regia Marina during the late 1920s. Completed in 1929,
Des Geneys was one of four Pisani-class submarines built for the Regia Marina during the late 1920s. Due to her age, her usefulness was limited, and she saw no real service during World War II. The submarine was decommissioned in 1942 and converted into a battery-charging hulk.
Giovanni Bausan was one of four Pisani-class submarines built for the Regia Marina during the late 1920s. Due to her age, her usefulness was limited, and she saw no real service during the war. The submarine was decommissioned in 1942 and converted into an oil barge.
Narvalo was one of four Squalo-class submarines built for the Regia Marina during the late 1920s. The boat served in World War II and was sunk in 1943 by British destroyers and aircraft.
The Bragadin-class submarines were built for the Regia Marina during the late 1920s. Both boats participated in the Second World War and were discarded in 1948.
Marcantonio Bragadin was the lead ship of her class of two submarines built for the Regia Marina during the late 1920s. The boats participated in the Second World War and was discarded in 1948.
Filippo Corridoni was one of two Bragadin-class submarines built for the Regia Marina during the late 1920s. The boat participated in the Second World War and was discarded in 1948.
