Bruno Boni started rowing with Canottieri Leonida Bissolati in 1932 in the coxless four and then in the pair with coxswain. He moved to Canottieri Baldesio and in 1939, alongside Felice Fanetti, won the Italian junior title in coxless pair at Pallanza, then winning the seniors in 1940 and 1941 at Como. The two also performed successfully in the four with coxswain between 1939 and 1941, until the war suspended all rowing competition in Italy.
In 1945 rowing resumed and the Boni-Fanetti duo won the Italian title in 1948-49, also winning several international regattas, with victory in Milano in the pre-Olympic race. In the two most important results they won bronze medals at the 1948 London Olympics and the 1949 European Championships in Amsterdam.