Emilio Largo is a fictional character and the main antagonist from the 1961 James Bond novel Thunderball. He appears in the 1965 film adaptation, again as the main antagonist, with Italian actor Adolfo Celi filling the role. Largo is also the main antagonist in the 1983 unofficial James Bond movie Never Say Never Again, a remake of Thunderball. In Never Say Never Again, the character's name, however, was changed to Maximillian Largo and he was portrayed by the Austrian actor Klaus Maria Brandauer.

Thunderball is the ninth book in Ian Fleming's James Bond series, and the eighth full-length Bond novel. It was first published in the UK by Jonathan Cape on 27 March 1961, where the initial print run of 50,938 copies quickly sold out. The first novelisation of an unfilmed James Bond screenplay, it was born from a collaboration by five people: Ian Fleming, Kevin McClory, Jack Whittingham, Ivar Bryce and Ernest Cuneo, although the controversial shared credit of Fleming, McClory and Whittingham was the result of a courtroom decision.