Nils Gustav von Kantzow (30 August 1885 – 7 November 1967) was a Swedish gymnast who competed in the 1908 Summer Olympics. He was a member of the Swedish team that won the all-around gold medal. He was born in a noble family and reached the rank of captain in the Swedish Army in 1916.
In 1910 von Kantzow married Carin Axelina Hulda Fock, but they were later separated. Their only child, Thomas von Kantzow, was born in 1913. A few days after their divorce in December 1922, Carin married the German airline pilot Hermann Göring, who later became a leader of the Nazi Party.