Maximilien François Marie Isidore de Robespierre (French: [mak.si.mi.ljɛ̃ fʁɑ̃.swa ma.ʁi i.zi.dɔʁ də ʁɔ.bɛs.pjɛʁ]; 6 May 1758 – 28 July 1794) was a French lawyer and politician. He was one of the best-known and most influential figures associated with the French Revolution and the Reign of Terror.

As a member of the Estates-General, the Constituent Assembly and the Jacobin Club, Robespierre was an outspoken advocate for the poor and for democratic institutions. He campaigned for universal male suffrage in France, price controls on basic food commodities and the abolition of slavery in the French colonies. But although he was an ardent opponent of the death penalty, he played an important role in arranging the execution of King Louis XVI, which led to the establishment of a French Republic.

He is perhaps best known for his role in the French Revolution's Reign of Terror. He was named as a member of the powerful Committee of Public Safety launched by his political ally Georges Danton and exerted his influence to suppress the left-wing Hébertists. As part of his attempts to use extreme measures to control political activity in France, Robespierre later moved against the more moderate Danton, who was accused of corruption and executed in April 1794. The Terror ended a few months later with Robespierre's arrest and execution in July, events that initiated a period in French history known as the Thermidorian Reaction. Robespierre's personal responsibility for the excesses of the Terror remains the subject of intense debate among historians of the French Revolution.

Influenced by 18th-century Enlightenment philosophes such as Rousseau and Montesquieu, Robespierre was a capable articulator of the beliefs of the left-wing bourgeoisie. His steadfast adherence and defense of the views he expressed earned him the nickname l'Incorruptible (The Incorruptible).

Robespierre's reputation has gone through several cycles of re-appraisal. During the Soviet Era, Robespierre was used as an example of a Revolutionary figure. His reputation peaked in the 1920s with the influence of French historian Albert Mathiez. In more recent times, his reputation has suffered as historians have associated him with an attempt at a radical purification of politics through the killing of enemies.