Brian Nielsen is a retired Danish professional boxer born in 1965 in Korsor, Denmark. Nielsen is a former IBC and IBO Heavyweight Champion. In 2011, he fought for the World Boxing Foundation Heavyweight Championship against Evander Holyfield and lost due to a TKO in the 10th round. He also lost to Mike Tyson in the third round in 2001. Nielsen had 104 wins and seven defeats in his amateur career. In 1991, he won a bronze medal in the super heavyweight division at the European Championships. He also participated in the 1992 Olympics and won a bronze medal. Nielsen retired from professional boxing in 2011 with 64 wins and three losses.