Aleksander Klumberg (since 1936 Kolmpere; 17 April 1899 – 10 February 1958) was an Estonian decathlete. He competed in several events at the 1920 and 1924 Olympics and won a bronze medal in the decathlon in 1924. In 1922 he became the first official world record holder in the decathlon, albeit with a performance inferior to the Stockholm 1912 series of Jim Thorpe.