Prince Amedeo, 3rd Duke of Aosta (Amedeo Umberto Isabella Luigi Filippo Maria Giuseppe Giovanni di Savoia-Aosta; 21 October 1898 – 3 March 1942) was the third Duke of Aosta and a first cousin, once removed of the King of Italy, Victor Emmanuel III. During World War II, he was the Italian Viceroy of Italian East Africa (Africa Orientale Italiana, or AOI).

Amedeo was born in Turin, Piedmont, to Prince Emanuele Filiberto, 2nd Duke of Aosta (son of Amadeo I of Spain and Princess Maria Vittoria) and Princess Hélène (daughter of Prince Philippe of Orléans and the Princess Marie Isabelle of Orléans). His great-grandfather was King Victor Emmanuel II of Italy, making him a member of the House of Savoy. He was known from birth by the courtesy title of Duke of Apulia.

Amedeo was a very tall man. According to Amedeo Guillet, he was once referred to by a journalist as "your highness" (which in Italian could also be interpreted to mean "your height"). The Duke replied in jest: "198 centimetres" (6 feet, 6 inches).

Amedeo was educated at St Andrew's School in England. He cultivated British mannerisms, spoke Oxford English, and even enjoyed the pastimes of fox hunting and polo. Amedeo entered the Italian Royal Army (Regio Esercito) and fought with distinction in the artillery during World War I. He left the army in 1921 and traveled widely in Africa.

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