The dechristianization of France during the French Revolution is a conventional description of the results of a number of separate policies conducted by various governments of France between the start of the French Revolution in 1789 and the Concordat of 1801, forming the basis of the later and less radical lacit policies. The aim of the campaign between 1790 and 1794 ranged from the appropriation by the government of the great landed estates and the large amounts of money held by the Gallican Church (the Roman Catholic Church in France) to the termination of Christian religious practice and of the religion itself. There has been much scholarly debate over whether the movement was popularly motivated.The French Revolution initially began with attacks on Church corruption and the wealth of the higher clergy, an action with which even many Christians could identify, since the Gallican Church held a dominant role in pre-revolutionary France. During a two-year period known as the Reign of Terror, the episodes of anti-clericalism grew more violent than any in modern European history. The new revolutionary authorities suppressed the Church, abolished the Catholic monarchy, nationalized Church property, exiled 30,000 priests, and killed hundreds more. In October 1793, the Christian calendar was replaced with one reckoned from the date of the Revolution, and Festivals of Liberty, Reason, and the Supreme Being were scheduled. New forms of moral religion emerged, including the deistic Cult of the Supreme Being and the atheistic Cult of Reason, with the revolutionary government briefly mandating observance of the former in April 1794.

The French Revolution (French: Révolution française [ʁevɔlysjɔ̃ fʁɑ̃sɛːz]) was a period of radical political and societal change in France that began with the Estates General of 1789 and ended with the formation of the French Consulate in November 1799. Many of its ideas are considered fundamental principles of liberal democracy, while phrases like liberté, égalité, fraternité reappeared in other revolts, such as the 1917 Russian Revolution, and inspired campaigns for the abolition of slavery and universal suffrage. The values and institutions it created dominate French politics to this day.Its causes are generally agreed to be a combination of social, political and economic factors, which the existing regime proved unable to manage. In May 1789, widespread social distress led to the convocation of the Estates General, which was converted into a National Assembly in June. Continuing unrest culminated in the Storming of the Bastille on 14 July, which led to a series of radical measures by the Assembly, including the abolition of feudalism, the imposition of state control over the Catholic Church in France, and extension of the right to vote.

The next three years were dominated by the struggle for political control, exacerbated by economic depression and Civil disorder. Opposition from external powers like Austria, Britain, and Prussia resulted in the outbreak of the French Revolutionary Wars in April 1792. Disillusionment with Louis XVI led to the establishment of the French First Republic on 22 September 1792, followed by his execution in January 1793. In June, an uprising in Paris replaced the Girondins who dominated the National Assembly with the Committee of Public Safety, headed by Maximilien Robespierre.

This sparked the Reign of Terror, an attempt to eradicate alleged "counter-revolutionaries"; by the time it ended in July 1794, over 16,600 had been executed in Paris and the provinces. As well as its external enemies, the Republic faced internal opposition from both Royalists and Jacobins and in order to deal with these threats, the French Directory took power in November 1795. Despite a series of military victories, many won by Napoleon Bonaparte, political divisions and economic stagnation resulted in the Directory being replaced by the Consulate in November 1799. This is generally seen as marking the end of the Revolutionary period.