Nils Gustav von Kantzow (30 August 1885 – 30 August 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.
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.