Johan Gabriel Oxenstierna af Korsholm och Wasa (28 August 1899 – 18 July 1995) was a Swedish modern pentathlete and naval officer.

[2][3] Oxenstierna belonged to one of the oldest noble families of Sweden, which is known from the 13th century.

In 1917 he became a Navy officer and in 1932 appointed naval attaché in Paris; upon his return to Sweden he was promoted to lieutenant commander.

His enciphered cables to his government were treacherously passed on to the Germans by a code clerk in Stockholm who deciphered them, becoming a major source of naval intelligence to the Nazi regime.

[3] In 1922 Oxenstierna married Görel Elisabeth Huitfeldt; they had two sons and one daughter.