Troisi is a surname of Italian origin. The name originates from the Latin Trogisii which refers to descendants of Trogisio or others of the same name. It may refer to:

Alfonso Troisi (b. 1954), Argentine former football player Dante Troisi (1920–1989), Italian writer and magistrate James Troisi (b. 1988), Australian football (soccer) player Licia Troisi (b. 1980), Italian fantasy writer Lino Troisi (1932–1998), Italian actor Marcello Troisi (b. 1976), Brazilian football player Massimo Troisi (1953–1994), Italian actor, film director and poet Pietro Paolo Troisi (1686–1743), Maltese artist Rebecca J. Troisi, American cancer epidemiologist

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