Sir Robert John Wilmot-Horton, 3rd Baronet, GCH, PC, FRS, born Robert John Wilmot, was a British politician, sociopolitical theorist, and colonial administrator. He was Under-Secretary of State for War and the Colonies between 1821 and 1828, and Governor of Ceylon between 1831 and 1837. He is most widely known for his writings on assisted emigration to the colonies of the British Empire.

The governor of Ceylon was the representative in Ceylon of the British Crown from 1795 to 1948. In this capacity, the governor was president of the Executive Council and Commander-in-Chief of the British Forces in Ceylon. The governor was the head of the British colonial administration in Ceylon, reporting to the Colonial Office.