Robert Stevenson Horne, 1st Viscount Horne of Slamannan, was a Scottish businessman, advocate and Unionist politician. He served under David Lloyd George as Minister of Labour between 1919 and 1920, as President of the Board of Trade between 1920 and 1921 and as Chancellor of the Exchequer between 1921 and 1922. In 1937 he was ennobled as Viscount Horne of Slamannan.

The president of the Board of Trade is head of the Board of Trade. A committee of the Privy Council of the United Kingdom, it was first established as a temporary committee of inquiry in the 17th century, that evolved gradually into a government department with a diverse range of functions. The current holder of the post is Kemi Badenoch, who is concurrently the secretary of state for business and trade.