Diacinto (or Giacinto) Cestoni (May 13, 1637 – January 29, 1718) was an Italian naturalist, biologist, botanist, entomologist. Born in Montegiorgio, he was self-taught. He lived and worked at Livorno where he led an apothecary next to the port. He studied insects, animals, plants and drugs. Cestoni showed that scabies is caused by Sarcoptes scabiei.