The MS Neptunia was an Italian ocean liner built by Cantiere Navale Triestino, Trieste for the Cosulich Line.

[1] She was launched on 27 December 1931 and on 5 October 1932, she left Trieste on her maiden voyage to Buenos Aires.

[1] In 1940, the ship was decommissioned for passenger service and was acquired by the Italian Navy as a troopship for the war effort.

At 2:00am on 19 August 1941, the Neptunia sailed from Naples in convoy with the Marco Polo, Esperia, and her sister ship, Oceania and naval escort ships bound for Tripoli.

[2] Whilst on the approaches to Tripoli, at about 10:20am on 20 August the Esperia was torpedoed three times by the British submarine HMS Unique.