Karl Hugo Wieslander (11 June 1889 – 24 May 1976) was a Swedish athlete, who competed in combined events. He set the inaugural world record in the pentathlon in Gothenburg, Sweden in 1911 with a score of 5516 points. The following year he finished second in the decathlon at the 1912 Summer Olympics in Stockholm, Sweden, 688 points behind Jim Thorpe. In 1913, after it was discovered that Thorpe played professional baseball for a minor league team, Thorpe was disqualified for not being an amateur. Wieslander was therefore declared the winner of the 1912 Olympics. He was awarded the Gold medal but refused to accept it. In 1982 Jim Thorpe was reinstated by the IOC with Hugo Wieslander as joint winners of the 1912 Olympic decathlon.