The 1975 Grand Prix motorcycle racing season was the 27th F.I.M. Road Racing World Championship season.

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.