Casaretto is a surname. Notable people with the surname include:
Caroline Casaretto (born 1978), German field hockey player Enrique Casaretto (1945–2020), Peruvian footballer Giovanni Casaretto (1810–1879), Italian botanist and explorer Marcelo Casaretto (born 1967), Argentine politician Pietro Casaretto (1810–1878), Italian Benedictine monk