Nils Otto Silfverskiöld (3 January 1888 – 18 August 1957) was a Swedish Olympic gymnast,[1] orthopedic surgeon and left-wing intellectual.

As a gymnast he won a gold medal in the Swedish system team event at the 1912 Summer Olympics.

In 1911 he graduated from the medical faculty of the Uppsala University, in 1916 received a doctor's degree, and in 1924 presented a PhD on the orthopedics of paralysis in children (German: Orthopädische Studie über Hemiplegia spastica infantilis), and later defended a habilitation.

In 1937, during the Spanish Civil War, he established a Swedish hospital in Spain to help the Republicans and later became president of the Swedish-Soviet Federation.

This resulted in a scandal at the wedding of Silfverskiöld and von Rosen when all the attendants (but not the groom and bride) made the Nazi salute to Göring.