The 1956 Nations motorcycle Grand Prix was the sixth and final round of the 1956 Grand Prix motorcycle racing season. It took place on 9 September 1956 at the Autodromo Nazionale Monza.

Carlo Ubbiali was an Italian professional motorcycle road racer. He competed in the FIM Grand Prix motorcycle racing world championships from 1949 to 1960, most prominently as a member of the MV Agust