Count Carl Johan Magnus Björnstjerna (7 April 1886 – 20 February 1982) was a Swedish officer and horse rider who competed in the 1928 Summer Olympics.

[3] Björnstjerna became a lieutenant in the Life Regiment Dragoons in 1909 and was promoted to ryttmästare in 1921.

He was promoted to lieutenant colonel and was posted as military attaché in London, Paris and Brussels from 1933 to 1935.

Björnstjerna was promoted to colonel in 1935 and served as commanding officer of Norrland Dragoon Regiment from 1935 to 1940.

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