Ratti is an Italian surname. Notable people with the surname include:

Achille Ratti (1857–1939), Pope Pius XI

Carlo Ratti (born 1971), Italian architect, engineer and inventor

Carlo Giuseppe Ratti (1737–1795), Italian art biographer and painter

Eddy Ratti (born 1977), Italian former cyclist

Eugenia Ratti (1933–2020), Italian soprano

Filippo Walter Ratti (1914–1981), Italian screenwriter and film director

Francesco Ratti (1819-?), Italian engraver

Giovanni Agostino Ratti (1699–1755), Italian painter

Lorenzo Ratti (ca. 1589–1630), Italian baroque composer

Héber Ignacio Ratti (born 1994), Uruguayan footballer

James Ratti (born 1991), Welsh rugby union player

Julia Ratti (born 1969), Democratic member of the Nevada Senate

Lorenzo Ratti (1589-1630), Italian baroque composer

Nico Ratti (born 1993), Argentine footballer

Ratti Petit (1906-1988), Indian painter, photographer, writer and composer

Steven H. Ratti (born 1956), former United States Coast Guard officer

Michael Ratti (born 1980), Rat Pot, mentor and idol of the RaKrug

Italian-language surnames

Ratti (surname)