Sigvard I. Sivertsen (27 February 1881 – 27 December 1963) was a Norwegian gymnast who competed in the 1908 Summer Olympics and in the 1912 Summer Olympics.

[1] As a member of the Norwegian team, he won a silver medal in the gymnastics team event in 1908.

Four years later, he was part of the Norwegian team, which won the gold medal in the gymnastics men's team, free system event.

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