Vittorio Jano
Image:VittorioJano-GianniLancia.jpg|thumb|Jano and Lancia owner Gianni Lancia.
Image:1962-07-31 Aerautodromo Modena Jano e Fantuzzi e Fiat e Ferrari.jpg|thumb|Jano and carrozzeria engineer Medardo Fantuzzi left on 31 July 1962.
Image:Vittorio Jano.jpg|thumb|Jano with Lancia drivers Luigi Villoresi, Alberto Ascari and Eugenio Castellotti at the 1955 Valentino Grand Prix in Turin on 27 March 1955
Vittorio Jano was an Italian automobile designer of Hungarian descent, active in European racing car engine design from the 1920s through 1960s.
Jano was born Viktor János in San Giorgio Canavese, in Piedmont, to Hungarian immigrants, who had arrived there several years earlier. He began at the car and truck company Società Torinese Automobili Rapid owned by G.B. Ceirano. In 1911 he moved to Fiat under Luigi Bazzi.
With Alfa Romeo
Jano moved with Bazzi to Alfa Romeo in 1923 to replace Giuseppe Merosi as chief engineer. At Alfa Romeo his first design was the 8-cylinder in-line mounted Alfa Romeo P2 Grand Prix car, which won Alfa Romeo the inaugural world championship for Grand Prix cars in 1925. In 1932, he produced the sensational Alfa Romeo P3 model, which later was raced with great success by Enzo Ferrari and his Scuderia Ferrari in 1933.For Alfa road cars Jano developed a series of small-to-medium-displacement 4-, 6-, and 8-cylinder inline power plants based on the P2 unit that established the classic architecture of Alfa engines, with light alloy construction, hemispherical combustion chambers, centrally located plugs, two rows of overhead valves per cylinder bank, and dual overhead cams. In 1936 he designed the Alfa Romeo 12C using a V12. The car's lack of success is given as the reason for Jano's resignation from Alfa Romeo at the end of 1937.