Captain Jens Harald Stefenson (1 February 1895 – 1 March 1986) was a Swedish Navy officer and diver who competed in the 1912 Summer Olympics.

[1] Stefenson was born on 1 February 1895 in Örebro, Sweden, the son of Per Karlsson, a master builder, and his wife Vilhelmina (née Larsson).

Stefenson became a navigation teacher in 1924 and was commissioned as a naval officer in the Swedish Navy in 1916 with the rank of acting sub-lieutenant.

[3] During postings on cadet ships, he participated in several trips to the Mediterranean, South America, and countries in Northern and Western Europe.

He was a teacher at the Non-Commissioned Officer's School (Underofficersskolan) from 1932 to 1935, company commander from 1936 to 1937, and head of department in the Naval Staff from 1940 to 1942.