Giotto Bizzarrini (6 June 1926 in Quercianella, Livorno Province, Italy) is an Italian automobile engineer active from the 1950s through the 1970s.
After graduating in 1953, Bizzarrini eventually joined Alfa Romeo as a test driver. He gained a reputation for identifying and solving problems and was head hunted by Ferrari in 1957. Bizzarrini's responsibility increased until he became sports car development chief at Ferrari in the late 1950s, working on such notable projects as the Ferrari 250 GTO. He split from the company as part of the 'Great Walkout' in 1961, worked first with ATS, and then in 1962 started his own company, Società Autostar, whose name was changed to Bizzarrini in 1964. In addition to producing the exotic Bizzarrini 5300 GT, Bizzarini also worked for other makers including Iso, Lamborghini, and Alfa Romeo. Several concept cars in the 2000s bear his name.