Lewenhaupt came from a noble family and was the son of Count Carl-Johan Lewenhaupt. In 1904 he became second lieutenant in a King’s dragoons regiment, and was promoted to lieutenant in 1906. After completing his studies at the National Defence College in 1909-11 and at the French Riding School in Saumur he briefly served in the Belgian army in 1913, though his main appointment was with the General Staff, where he served in 1912-14 and 1916–22, reaching the rank of captain in 1917. After that he headed the Swedish railway police and co-founded the Brunkeberg Club, a Swedish nationalist political association.
In parallel to his military activities Lewenhaupt acted as a sport functionary, being the secretary of a jockey club. As a member of the Swedish Olympic Committee he represented Sweden at the Olympic Congresses in Lausanne and Paris.
References
{{authority control}}{{DEFAULTSORT:Lewenhaupt, Carl Gustaf}}{{Sweden-Olympic-medalist-stub}}{{equestrian-bio-stub}} 13 : 1884 births|1935 deaths|Swedish male equestrians|Swedish nobility|Equestrians at the 1920 Summer Olympics|Equestrians at the 1924 Summer Olympics|Olympic equestrians of Sweden|Olympic silver medalists for Sweden|Olympic bronze medalists for Sweden|Olympic medalists in equestrian|Sportspeople from Örebro|Swedish Army majors|Medalists at the 1920 Summer Olympics