Hans Jacob Horst (7 November 1848 – 17 March 1931) was a Norwegian politician for the Liberal Party.
He graduated with a master's degree in liberal arts in 1874, becoming a teacher and later principal.
He was chair of the parliament Peace Association from 1900 and a member of the International Court of Arbitration in The Hague from 1906 to 1929.
He was a member of the Norwegian Nobel Committee from 1903 to 1931.
This article about a Norwegian politician born between 1800 and 1809 is a stub.