The Representation of the People Act 1832 (known informally as the 1832 Reform Act, Great Reform Act or First Reform Act to distinguish it from subsequent Reform Acts) was an Act of Parliament (indexed as 2 & 3 Will. IV c. 45) that introduced wide-ranging changes to the electoral system of England and Wales. According to its preamble, the Act was designed to "take effectual Measures for correcting divers Abuses that have long prevailed in the Choice of Members to serve in the Commons House of Parliament". Before the reform, most members nominally represented boroughs. The number of electors in a borough varied widely, from a dozen or so up to 12,000. Frequently the selection of MPs was effectively controlled by one powerful patron: for example Charles Howard, 11th Duke of Norfolk controlled eleven boroughs. Criteria for qualification for the franchise varied greatly among boroughs, from the requirement to own land, to merely living in a house with a hearth sufficient to boil a pot.
There had been calls for reform long before 1832, but without success. The Act that finally succeeded was proposed by the Whigs, led by Prime Minister Charles Grey, 2nd Earl Grey. It met with significant opposition from the Pittite factions in Parliament, who had long governed the country; opposition was especially pronounced in the House of Lords. Nevertheless, the bill was eventually passed, mainly as a result of public pressure. The Act granted seats in the House of Commons to large cities that had sprung up during the Industrial Revolution, and removed seats from the "rotten boroughs": those with very small electorates and usually dominated by a wealthy patron. The Act also increased the electorate from about 500,000 to 813,000, with about one in five adult males allowed to vote, from a total population (including women and children) of some 14 million (about 5.8% of the total population - in comparison: in Baden, Germany, it was 17% at that time, in France 5%).