Gustaf Jacob Horn

{{Short description|Swedish baron}}

File:Lord Chamberlain Gustaf Jakob Horn af Rantzien, by Olof Arenius.jpg)]]

Gustaf Jacob Horn af Rantzien (1706–1756) was a Swedish baron. He was executed for treason as one of the conspirators participating in the failed coup d'etat of queen Louisa Ulrika, the Coup of 1756. {{cite web|url=https://www.geni.com/people/Gustaf-Jakob-Horn-af-Rantzien/6000000008366072294| title= Lord Chamberlain Gustaf Jakob Horn af Rantzien |publisher=Geni.com|accessdate=2019-07-13}}