The Slavery Abolition Act 1833 was an Act of the Parliament of the United Kingdom which provided for the gradual abolition of slavery in most parts of the British Empire. It was passed by Earl Grey's reforming administration and expanded the jurisdiction of the Slave Trade Act 1807 and made the purchase or ownership of slaves illegal within the British Empire, with the exception of "the Territories in the Possession of the East India Company", Ceylon, and Saint Helena. The Act came into force on 1 August 1834, and was repealed in 1998 as a part of wider rationalisation of English statute law; however, later anti-slavery legislation remains in force.

Charles Grey, 2nd Earl Grey, known as Viscount Howick between 1806 and 1807, was a British Whig politician who served as Prime Minister of the United Kingdom from 1830 to 1834. He was a descendant of the House of Grey and the namesake of Earl Grey tea. Grey was a long-time leader of multiple reform movements. During his time as prime minister, his government brought about two notable reforms. The Reform Act 1832 enacted parliamentary reform, greatly increasing the electorate of the House of Commons.