The ancien régime (/ˌɒ̃sjæ̃ reɪˈʒiːm/; French: [ɑ̃sjɛ̃ ʁeʒim] ^ⓘ; lit. 'old rule') was the political and social system of the Kingdom of France that the French Revolution overturned through its abolition in 1790 of the feudal system of the French nobility and in 1792 through its execution of King Louis XVI and declaration of a republic. "Ancien régime" is now a common metaphor for "a system or mode no longer prevailing".

The administrative and social structures of the ancien régime in France evolved across years of state-building, legislative acts (like the Ordinance of Villers-Cotterêts), and internal conflicts. The attempts of the House of Valois to reform and re-establish control over the scattered political centres of the country were hindered by the Wars of Religion from 1562 to 1598. During the House of Bourbon, much of the reigns of Henry IV (r. 1589–1610) and Louis XIII (r. 1610–1643) and the early years of Louis XIV (r. 1643–1715) focused on administrative centralization. Despite the notion of "absolute monarchy" (typified by the king's right to issue orders through lettres de cachet) and efforts to create a centralized state, ancien régime France remained a country of systemic irregularities: administrative, legal, judicial, and ecclesiastic divisions and prerogatives frequently overlapped, the French nobility struggled to maintain their influence in local judiciary and state branches while the Fronde and other major internal conflicts violently contested additional centralization.

The drive for centralization related directly to questions of royal finances and the ability to wage war. The internal conflicts and dynastic crises of the 16th and the 17th centuries between Catholics and Protestants, the Habsburgs' internal family conflict, and the territorial expansion of France in the 17th century all demanded great sums, which needed to be raised by taxes, such as the land tax (taille) and the tax on salt (gabelle), and by contributions of men and service from the nobility.

One key to the centralization was the replacing of personal patronage systems, which had been organised around the king and other nobles, by institutional systems that were constructed around the state. The appointments of intendants, representatives of royal power in the provinces, greatly undermined the local control by regional nobles. The same was true of the greater reliance that was shown by the royal court on the noblesse de robe as judges and royal counselors. The creation of regional parlements had the same initial goal of facilitating the introduction of royal power into the newly assimilated territories, but as the parlements gained in self-assurance, they started to become sources of disunity.

By the end of 1789 the term Ancien Régime was commonly used in France by journalists and legislators to refer to the institutions of French life before the Revolution. It first appeared in print in English in 1794 (two years after the inauguration of the First French Republic) and was originally pejorative. Simon Schama has observed that "virtually as soon as the term was coined, 'old regime' was automatically freighted with associations of both traditionalism and senescence. It conjured up a society so encrusted with anachronisms that only a shock of great violence could free the living organism within. Institutionally torpid, economically immobile, culturally atrophied and socially stratified, this 'old regime' was incapable of self-modernization".

The Nine Years' War (1688–97), between France and a coalition of Austria and the Holy Roman Empire, the Dutch Republic, Spain, England and Savoy, was fought in continental Europe and on the surrounding seas, and in Ireland, North America and India. It was the first truly global war.

Louis XIV emerged from the Franco-Dutch War in 1678 as the most powerful monarch in Europe and an absolute ruler with numerous military victories. Using a combination of aggression, annexation and quasilegal means, he set about extending his gains to stabilize and strengthen France's frontiers, culminating in the brief War of the Reunions (1683–1684). The resulting Truce of Ratisbon guaranteed France's new borders for 20 years, but Louis XIV's subsequent actions, notably his revocation of the Edict of Nantes in 1685, led to the deterioration of his military and political dominance. Louis XIV's decision to cross the Rhine in September 1688 was designed to extend his influence and to pressure the Holy Roman Empire into accepting his territorial and dynastic claims, but Leopold I and the German princes resolved to resist, and the States General and William III brought the Dutch and the English into the war against France. Louis XIV faced a powerful coalition aimed at curtailing his ambitions.

The main fighting took place around France's borders in the Spanish Netherlands, the Rhineland, the Duchy of Savoy, and Catalonia. The fighting generally favoured Louis XIV's armies, but by 1696, France was in the grip of an economic crisis. The maritime powers (England and the Dutch Republic) were also financially exhausted, and when Savoy defected from the alliance, all of the parties were keen for a negotiated settlement. By the terms of the Treaty of Ryswick (1697), Louis XIV retained the whole of Alsace, but was forced to return Lorraine to its ruler and to give up any gains on the right bank of the Rhine. Also, Louis XIV accepted William III as the rightful King of England, and the Dutch acquired their barrier fortress system in the Spanish Netherlands to help secure their own borders. However, with the ailing and childless Charles II of Spain approaching his end, a new conflict over the inheritance of the Spanish Empire would soon embroil Louis XIV and the Grand Alliance in a final war: the War of the Spanish Succession.^{[citation needed]}