F20 was an F-class submarine in commission in the Italian Regia Marina (Royal Navy) from 1918 to 1935. She took part in the Adriatic Campaign of
Design
Construction and commissioning In June 1915, FIAT-San Giorgio laid down an F-class submarine for the Italian Regia Marina (Royal Navy) at Italy. Originally designated F20, that submarine was sold to Portugal and entered service in the Portuguese Navy as NRP Golfinho.
To replace the first F20, the Regia Marina ordered a second submarine also designated F20. FIAT-San Giorgio laid down the second F20 at La Spezia on 1915. She was launched on 1918 and commissioned into service in the Regia Marina as F20 on 1918.
Service history In August 1918, the Italian Regia Marina (Royal Navy) assigned F20 to the Brindisi Submarine Squadron for operations in the southern Adriatic Sea during the Adriatic Campaign of Before the war ended in November 1918, she had carried out three war patrols along the coast of Austria-Hungary, but without significant results.
At the end of World War I, F20 was transferred to the Venice Maritime Command for operations in the northern Adriatic Sea. She returned to the Brindisi Submarine Squadron in April 1919, but was transferred to Naples in May 1919. In February 1923 she was transferred to the 3rd Squadron of the 2nd Submarine Flotilla at Taranto. She participated in the naval maneuvers of 1925 and 1926.
F20 was placed in reserve in January 1927. She was decommissioned and stricken from the navy list on . She subsequently was scrapped.
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