Giannetti is an Italian surname.
It may refer to:
Alfredo Giannetti (1924–1995), Italian screenwriter and film editor
Eduardo Giannetti da Fonseca (born 1957), Brazilian economist and author
Filippo Giannetti or Giannetto (1630-1702), Italian painter
John A. Giannetti, Jr. (born 1964), American politician
Niccolò Giannetti (born 1991), Italian footballer