Sten Johan Theodor Claes Ankarcrona (January 17, 1861; December 27, 1936) was the son of Commander Johan Ankarcrona and Ebba Bergenstråhle. He was a cadet in 1873 and a second lieutenant in the navy in 1879 and served in the French navy from 1885–1889.
Ankarcrona became captain in 1889, commander captain of the 2nd rank in 1900, commander in 1907 and later documented himself during a 15-year service in the Naval Staff. In 1911, Ankarcrona was appointed Chief of the Naval Staff but resigned from the navy in the autumn of 1913, when the said position, for reasons other than military, received a new holder. He entered the fleet reserve as a commander in 1914 and was ordered to the personal service of the king, and in 1915 was assigned to Copenhagen to discuss joint convoying of the merchant ships of the Nordic countries during the First World War. In 1916 he was appointed rear admiral in the fleet reserve and was sent on a special mission to Japan in 1923. Ankarcrona participated as an expert in naval and economic matters in several committees and investigations.
He became a member of the Royal Swedish Academy of War Sciences' second class in 1900, a member of its first class in 1914, a member of the Royal Swedish Naval Academy in 1896 and an honorary member there in 1913, chairman of Asea , Svenska Turbinfabriks AB Ljungström , board member of Husqvarna vapenfabrik AB , chairman or member of the 1916 committee, deputy member of the national valuation board.