The Slavery Abolition Act 1833 was an 1833 Act of the Parliament of the United Kingdom abolishing slavery throughout the British Empire. The Act was repealed in 1998 as part of a wider rationalisation of English statute law, but later anti-slavery legislation remains in force.

The Act had its third reading in the House of Commons on 26 July 1833, three days before William Wilberforce died. It received the Royal Assent a month later, on 28 August, and came into force the following year, on 1 August 1834. In practical terms, only slaves below the age of six were freed in the colonies. Former slaves over the age of six were redesignated as "apprentices", and their servitude was abolished in two stages: the first set of apprenticeships came to an end on 1 August 1838, while the final apprenticeships were scheduled to cease on 1 August 1840. The Act specifically excluded "the Territories in the Possession of the East India Company, or to the Island of Ceylon, or to the Island of Saint Helena." The exceptions were eliminated in 1843.

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