Iwan Lamby (October 29, 1885 – January 15, 1970) was a Swedish sailor who competed in the 1912 Summer Olympics.

He was a crew member of the Swedish boat Erna Signe, which won the silver medal in the 12 metre class.

[1] Iwan's father Boris Roland Lamby, (1856-1893), was (unofficially) one of his mother's, Wilhelmina (Mina) Lamby (1834-1863), five children with the Tsar Alexander II of Russia Iwan is buried in a 10 m2 vault at the church of Klara in Stockholm.

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