The Representation of the People Act 1832 (2 & 3 Will. 4. c. 45), also known as the Reform Act 1832, Great Reform Act or First Reform Act, was an act of the Parliament of the United Kingdom to reform the electoral system in England and Wales and to expand the franchise. The measure was brought forward by the Whig government of Prime Minister Charles Grey, 2nd Earl Grey.

The legislation granted the right to vote to a broader segment of the male population by standardizing property qualifications, extending the franchise to small landowners, tenant farmers, shopkeepers, and all householders who paid a yearly rental of £10 or more. The act also reapportioned constituencies to address the unequal distribution of seats. The act formally excluded women from voting, as a voter was defined in the Act as a male person; prior to 1832 there were occasional, rare, instances of women voting. The act of England and Wales was accompanied by the Scottish Reform Act 1832 (2 & 3 Will. 4. c. 65) and Irish Reform Act 1832 (2 & 3 Will. 4. c. 88).

The act was repealed by the Representation of the People Act 1948. The electoral system in the UK is now defined principally by the Representation of the People Act 1983 and the Electoral Administration Act 2006.

Reform Act 1832
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Before the reform, most members of Parliament nominally represented boroughs. However, the number of electors in a borough varied widely, from a dozen or so up to 12,000. The criteria for qualification for the franchise also varied greatly among these boroughs, from the requirement to own land, to merely living in a house with a hearth sufficient to boil a pot.

The Irish Reform Act 1832 (2 & 3 Will. 4 c. 88) brought similar changes to Ireland, and the separate Scottish Reform Act 1832 (2 & 3 Will. 4 c. 65) was revolutionary, enlarging the electorate by a factor of 13 from 5,000 to 65,000.

The historiography of the Reform Act is marked by longstanding debates over its causes, nature, and impact. Scholars have long grappled with whether it was a radical modernizing movement that expanded democracy by widening the franchise or a conservative measure intended to preserve aristocratic rule by making necessary concessions.