Giacomo Agostini is an Italian former Grand Prix motorcycle road racer. Nicknamed Ago, he amassed 122 Grand Prix wins and 15 World Championship titles. Of these, 68 wins and 8 titles came in the 500 cc class, the rest in the 350 cc class. For these achievements obtained over the course of a career spanning 17 years, the AMA described him as "...perhaps the greatest Grand Prix rider of all time". In 2000, Agostini was inducted into the MotoGP Hall of Fame as a MotoGP Legend, while in 2010, he was named an FIM Legend for his motorcycling achievements.

Grand Prix motorcycle racing is the highest class of motorcycle road racing events held on road circuits sanctioned by the Fédération Internationale de Motocyclisme (FIM). Independent motorcycle racing events have been held since the start of the twentieth century and large national events were often given the title Grand Prix. The foundation of the Fédération Internationale de Motocyclisme as the international governing body for motorcycle sport in 1949 provided the opportunity to coordinate rules and regulations in order that selected events could count towards official World Championships. It is the oldest established motorsport world championship.