Sergio Donati (born 13 April 1933) is an Italian screenwriter. He has written for more than 70 films since 1952. He was born in Rome, Italy. He started as a writer and had some of his books optioned for film. He is well known for his collaboration with Italian director Sergio Leone, who encouraged him to take up screenwriting as a full-time career, and with Italian producer Dino de Laurentis.