List of Famous people named Clas

Arnold Clas ("Classe") Robert Thunberg was a Finnish speed skater who won five Olympic gold medals – three at the inaugural Winter Olympics held in Chamonix in 1924 and two at the 1928 Winter Olympics held in St. Moritz. He was the most successful athlete at both of these Winter Olympics, sharing the honour for 1928 Winter Olympics with Johan Grøttumsbraaten of Norway. No other athlete ever won such a high fraction of all Olympic events at a single Games. He was born and died in Helsinki.

Baron Clas Alströmer was a Swedish naturalist who was a student of Carl Linnaeus at Uppsala University. From 1760 to 1764 he traveled throughout Southern Europe, collecting plants for Linnaeus. He established a botanical garden and natural museum near Gothenburg which was managed by the notable botanist Anders Dahl, another student of Linnaeus. Alströmer was the son of the industrialist Jonas Alströmer. The genus Alstroemeria was named after him by Linnaeus.

Clas Larsson Fleming was an admiral and administrator involved in the development of a formal management structure for the Royal Swedish Navy under King Gustav II Adolf and Queen Christina. He is remembered as one of the ablest administrators in the history of the Swedish navy, and is in many ways a typical example of the type of aristocrat who served the Swedish Crown during the period of Sweden's imperial expansion.

Clas Åkesson Tott was a military Field Marshal (1572) and member of the Privy Council of Sweden (1575).