Kenneth Leroy Roberts Jr. is an American former professional Grand Prix motorcycle road racer who won the 2000 FIM Road Racing World Championship, after finishing runner-up in 1999. Roberts Jr. is an 8-time Premier Class race winner. He joins his father Kenny Roberts as the only father-son duo to have won 500cc World Championships. Roberts was inducted into the F.I.M. MotoGP Hall of Fame in 2017.

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.