Amadeo is a Spanish name derived from the Latin theophoric name Amadeus. It may refer to:

• Amadeo I of Spain (1845–1890)
• Amadeo Bordiga (1889–1970), founder of the Communist Party of Italy
• Amadeo Giannini, co-founder of the Bank of America
• Amadeo Labarta (1905–1989), Spanish footballer
• Amadeo Marco Ilincheta (1900-1987), Spanish politician
• Giovanni Antonio Amadeo, Italian sculptor
• Mario Amadeo (1911–1983), Argentine politician, diplomat and writer
• Mike Amadeo, American musician and composer
• Roberta Amadeo (born 1970), Italian para-cyclist

• Amadeo (Austrian record label)
• Amadeo, Cavite, a municipality in Cavite, Philippines
• Casa Amadeo, antigua Casa Hernandez, an historic Latin music store in New York City

• All pages with titles beginning with Amadeo
• All pages with titles containing Amadeo
• Amadea (disambiguation)
• Amadee (disambiguation)
• Amédée (disambiguation)
• Amadeus (disambiguation)
• Amadeu (given name), the Catalan and Portuguese variant of the name
• Amedeo, the Italian form of the name