Umberto II (Italian: Umberto Nicola Tommaso Giovanni Maria di Savoia; 15 September 1904 – 18 March 1983), was the last King of Italy. He reigned for 34 days, from 9 May 1946 until his formal abdication on 12 June 1946, although he had been de facto head of state since 1944. He was nicknamed the May King (Italian: Re di Maggio).

Umberto was the only son among the five children of King Victor Emmanuel III and Elena of Montenegro. As heir apparent to the throne, he received a customary military education and pursued a military career afterwards. He commanded an army group during the failed Italian invasion of France shortly before French capitulation. In 1942, he was promoted to Marshal of Italy but was otherwise inactive as an army commander during much of the Second World War. Umberto turned against the war following Italian defeats at Stalingrad and El Alamein and tacitly supported the ouster of Benito Mussolini. In 1944, Victor Emmanuel, compromised by his association with Fascism and desperate to repair the monarchy's image, transferred most of his powers to Umberto. Umberto was named Lieutenant General of the Realm, although Victor Emmanuel retained the title of King. In May 1946, as Italy prepared for a referendum on the continuation of the monarchy, Victor Emmanuel abdicated his throne in favour of Umberto, in the hope that his exit might bolster the monarchy. The referendum saw voters choosing the abolition of the monarchy, and Italy was declared a republic days later. Umberto departed the country and was barred from returning. He lived out the rest of his life in exile in Cascais, on the Portuguese Riviera. He died in Geneva in 1983.