1959 Grand Prix motorcycle racing season

John Surtees (pictured in 1958) won all races to retain his 350cc and 500cc World Championship title.
Carlo Ubbiali (pictured in 1956) successfully defended his 125cc World Championship title. He also became the 250cc World Champion in 1959.

The 1959 Grand Prix motorcycle racing season was the 11th F.I.M. Road Racing World Championship Grand Prix season. The season consisted of seven Grand Prix races in five classes: 500cc, 350cc, 250cc, 125cc and Sidecars 500cc. It began on 17 May, with French Grand Prix and ended with Nations Grand Prix in Italy on 6 September.