Flavio Joseph "Bull" Tosi (April 30, 1912 – December 28, 1994) was an American football player and coach.

[1] Tosi joined the Boston Redskins of the National Football League (NFL) in August 1934; he was the first Boston College player to play in the NFL.

[2] He played for the Redskins from 1934 to 1936 and for the Providence Steam Roller in 1937.

[1][3] He appeared in 28 NFL games, scored two touchdowns, and tallied 265 receiving yards.

[4] After his football career ended, Tosi worked as an employee benefits administrator for 34 years with General Electric.