Rietti was known for lending his voice to James Bond villains when filmmakers wanted to re-record lines.
According to The Times, Rietti died on April 3.
Among the villains he dubbed were Emilio Largo (Adolfo Celi) in 1965's Thunderball and Ernst Stavro Blofeld (John Hollis) in 1981's For Your Eyes Only.
"In nearly every Bond picture, there's been a foreign villain, and in almost every case, they've used my voice," Rietti once said.
Throughout his career, he also voiced characters in The Guns of Navarone (1961), Lawrence of Arabia (1962), The Fall of the Roman Empire (1964), Doctor Zhivago (1965), Barbarella (1968), Frenzy (1972), Murder on the Orient Express (1974) and Trail of the Pink Panther (1982).