Johan Leonhard Fix (28 December 1735 - 2 February 1807) was a German-Danish merchant who served as Governor of Frederiknagore in Danish India.

He moved to Copenhagen in 1787 where he served as director of the Danish Asiatic Company from 1791 to 1805.

Fix travelled to Copenhagen on foot where he was employed as bookkeeper by the Danish Asiatic Company in 1867 and travelled to Trankebar and the Bengal on board the ship CRON PRINCEN AF DANEMARK.

She was the widow of Hermann Fredericks Henckel, a Danish Asiatic Company merchant and former Oberhoved of Frederiksnagore.

Then, in a partnership with John Fenwick, he ran a private trading house with a fleet of up to five ships.