In English church history, a nonconformist was a Protestant Christian who did not "conform" to the governance and usages of the established Church of England. Broad use of the term was precipitated after the Restoration of the British monarchy in 1660, when the Act of Uniformity 1662 re-established the opponents of reform within the Church of England. By the late 19th-century the term specifically included the Reformed Christians (Presbyterians, Congregationalists, Calvinist sects of the "reformed" tradition), plus the Baptists and Methodists. The English Dissenters such as the Puritans who violated the Act of Uniformity 1559—typically by practising radical, sometimes separatist, dissent—were retrospectively labelled as nonconformists.
By law and social custom, nonconformists were restricted from many spheres of public life—not least, from access to public office, civil service careers, or degrees at university—and were referred to as suffering from civil disabilities. In England and Wales in the late 19th century the new terms "free churchman" and "Free Church" started to replace "dissenter" or "Nonconformist."
The Act of Uniformity of 1662 required churchmen to use all rites and ceremonies as prescribed in the Book of Common Prayer. It also required episcopal ordination of all ministers of the Church of England—a pronouncement most odious to the Puritans, the faction of the church which had come to dominance during the English Civil War and the Interregnum. Consequently, nearly 2,000 clergymen were "ejected" from the established church for refusing to comply with the provisions of the act, an event referred to as the Great Ejection. The Great Ejection created an abiding public consciousness of non-conformity.
Thereafter, a Nonconformist was any English subject belonging to a non-Anglican church or a non-Christian religion. More broadly, any person who advocated religious liberty was typically called out as Nonconformist. The strict religious tests embodied in of the laws of the Clarendon code and other penal laws excluded a substantial section of English society from public affairs and benefits, including certification of university degrees, for well more than a century and a half. Culturally, in England and Wales, discrimination against Nonconformists endured even longer.
Presbyterians, Congregationalists, Baptists, Calvinists, other "reformed" groups and less organized sects were identified as Nonconformists at the time of the 1662 Act of Uniformity. Following the act, other groups, including Methodists, Unitarians, Quakers, Plymouth Brethren, and the English Moravians were officially labelled as Nonconformists as they became established.
The term dissenter later came into particular use after the Act of Toleration (1689), which exempted those Nonconformists who had taken oaths of allegiance from being penalized for certain acts, such as for non-attendance to Church of England services.
A religious census in 1851 revealed Nonconformist comprised about half that of the people who attended church services on Sundays. In the larger manufacturing areas, Nonconformists clearly outnumbered members of the Church of England. In Wales in 1850, Nonconformist chapel attendance significantly outnumbered Anglican church attendance.
Historians distinguish two categories of Dissenters, or Nonconformists, in addition to the evangelicals or "Low Church" element in the Church of England. "Old Dissenters," dating from the 16th and 17th centuries, included Baptists, Congregationalists, Quakers, Unitarians, and Presbyterians outside Scotland. "New Dissenters" emerged in the 18th century and were mainly Methodists. The "Nonconformist Conscience" was their moral sensibility which they tried to implement in British politics. The "Nonconformist conscience" of the Old group emphasized religious freedom and equality, pursuit of justice, and opposition to discrimination, compulsion, and coercion. The New Dissenters (and also the Anglican evangelicals) stressed personal morality issues, including sexuality, temperance, family values, and Sabbath-keeping. Both factions were politically active, but until mid-19th century the Old group supported mostly Whigs and Liberals in politics, while the New --like most Anglicans -- generally supported Conservatives. In the late 19th the New Dissenters mostly switched to the Liberal Party. The result was a merging of the two groups, strengthening their great weight as a political pressure group. The joined together on new issues especially regarding schools and temperance. By 1914 the linkage was weakening and by the 1920s it was virtually dead.
Parliament had imposed a series of disabilities on Nonconformists that prevented them from holding most public offices, that required them to pay local taxes to the Anglican church, be married by Anglican ministers, and be denied attendance at Oxford or degrees at and Cambridge. Dissenters demanded removal of political and civil disabilities that applied to them (especially those in the Test and Corporation Acts). The Anglican establishment strongly resisted until 1828. The Test Act of 1673 made it illegal for anyone not receiving communion in the Church of England hold office under the crown. The Corporation Act of 1661 did likewise for offices in municipal government. In 1732, Nonconformists in the City of London created an association, the Dissenting Deputies to secure repeal of the Test and Corporation acts. The Deputies became a sophisticated pressure group, and worked with liberal Whigs to achieve repeal in 1828. It was a major achievement for an outside group, but the Dissenters were not finished.
Next on the agenda was the matter of church rates, which were local taxes at the parish level for the support of the parish church building in England and Wales. Only buildings of the established church received the tax money. Civil disobedience was attempted, but was met with seizure of personal property and even imprisonment. The compulsory factor was finally abolished in 1868 by William Ewart Gladstone, and payment was made voluntary. While Gladstone was a moralistic evangelical inside the Church of England, he had strong support in the Nonconformist community. The marriage question was settled in 1837, by allowing local government registrars to handle marriages. Nonconformist ministers in their own chapels were allowed to marry couples if a registrar was present. Also in 1836, civil registration of births, deaths, and marriages was taken from the hands of local parish officials and given to local government registrars. Burial of the dead was a more troubling problem, for urban chapels had no graveyards, and sought to use the traditional graveyards controlled by the established church. The Burials Act of 1880 finally allowed that.
Oxford University required students seeking admission to submit to the 39 articles of the Church of England. Cambridge required that for a diploma. The two ancient universities opposed giving a charter to the new London University in the 1830s because it had no such restriction. London University, nevertheless, was established in 1837, and by the 1850s Oxford dropped its restrictions. In 1871 Gladstone sponsored legislation that provided full access to degrees and fellowships. The Scottish universities never had restrictions.
Since 1660, nonconformist Protestants have played a major role in English politics.
The Nonconformist cause was linked closely to the Whigs, who advocated civil and religious liberty. After the Test and Corporation Acts were repealed in 1828, all the Nonconformists elected to Parliament were Liberals.
Relatively few MPs were dissenters. However the Dissenters were major voting bloc in many areas, such as East Midlands. They were very well organized and highly motivated and largely won over the Whigs and Liberals to their cause. Gladstone brought the majority of dissenters around to support for Home Rule for Ireland, putting the dissenting Protestants in league with the Irish Roman Catholics in an otherwise unlikely alliance. The dissenters gave significant support to moralistic issues, such as temperance and sabbath enforcement. The nonconformist conscience, as it was called, was repeatedly called upon by Gladstone for support for his moralistic foreign policy. In election after election, Protestant ministers rallied their congregations to the Liberal ticket. In Scotland, the Presbyterians played a similar role to the Nonconformist Methodists, Baptists and other groups in England and Wales  The political strength of Dissent faded sharply after 1920 with the secularization of British society in the 20th century. The rise of the Labour Party reduced the Liberal Party strongholds into the nonconformist and remote "Celtic Fringe," where it survived by an emphasis on localism and historic religious identity, thereby neutralizing much of the class pressure on behalf of the Labour movement. Meanwhile, the Anglican church was a bastion of strength for the Conservative party. On the Irish issue, the Anglicans strongly supported unionism. Increasingly after 1850, the Roman Catholic element in England and Scotland consisted of recent immigrants from Ireland. They voted largely for the Irish Parliamentary Party, until its collapse in 1918.
Nonconformists were angered by the Education Act 1902, which integrated denominational schools into the state system and provided for their support from taxes. The local school boards that they largely controlled were abolished and replaced by county governments that were usually controlled by Anglicans. Worst of all the hated Anglican schools would now receive funding from local taxes that everyone had to pay. One tactic was to refuse to pay local taxes. John Clifford formed the National Passive Resistance Committee. By 1904 over 37,000 summonses for unpaid school taxes were issued, with thousands having their property seized and 80 protesters going to prison. It operated for another decade but had no impact on the school system. The education issue played a major role in the Liberal victory in the 1906 general election, as Dissenter Conservatives punished their old party and voted Liberal. However the Liberals failed repeatedly to repeal or modify the 1902 law.
Today, Protestant churches independent of the Anglican Church of England or the Presbyterian Church of Scotland are often called "free churches", meaning they are free from state control. This term is used interchangeably with "Nonconformist". In Scotland, the Anglican Scottish Episcopal Church is considered Nonconformist (despite its English counterpart's status) and in England, the United Reformed Church, principally a union of Presbyterians and Congregationalists, is in a similar position.
In Wales the strong traditions of Nonconformism can be traced to the Welsh Methodist revival; Wales effectively had become a Nonconformist country by the mid-19th century. The influence of Nonconformism in the early part of the 20th century, boosted by the 1904–1905 Welsh Revival, led to the disestablishment of the Anglican Church in Wales in 1920 and the formation of the Church in Wales.
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