Louis, Duke of Burgundy and later Dauphin of France (16 August 1682 – 18 February 1712) was the eldest son of Louis, Grand Dauphin, and father of Louis XV, and briefly heir-apparent to the throne from his father's death in April 1711 to his own death 10 months later. Until he became the official Dauphin of France upon his father's death in 1711, he was known as Le Petit Dauphin to distinguish him from his father, who was known as le Grand Dauphin. His legitimate male progeny died out in 1883.

Louis was born in the Palace of Versailles, the eldest son of the young 21-year-old Dauphin, Louis, who would later be called le Grand Dauphin, and his wife, Maria Anna Victoria of Bavaria. His father was the eldest son of King Louis XIV of France, by then at the height of his powers at age 44. At birth, he received the title of Duke of Burgundy (duc de Bourgogne). In addition, as the son of the Dauphin and grandson to the king, he was a fils de France and also second in the line of succession to his grandfather, King Louis XIV after his father.

Louis grew up with his younger brothers: Philip, Duke of Anjou, who became King Philip V of Spain; and Charles, Duke of Berry, under the supervision of the royal governess Louise de Prie. He lost his mother when he was eight. His father never played a major role in politics.

At the age of 15, he was married to his second cousin, Princess Marie-Adélaïde of Savoy, the daughter of Victor Amadeus II, Duke of Savoy and Anne Marie d'Orléans. This match had been decided as part of the Treaty of Turin, which ended Franco-Savoyard conflicts during the Nine Years' War. The wedding took place on 7 December 1697 at the Palace of Versailles.

In 1702, at the age of twenty, the Duke of Burgundy was admitted by his grandfather King Louis XIV to the Conseil d'en haut (High Council), which was in charge of state secrets regarding religion, diplomacy and war. His father had been admitted only at the age of thirty.

In 1708, during the War of the Spanish Succession, Louis was given command of the army in Flanders, with the experienced soldier Louis Joseph, Duke of Vendôme, serving under him. The uncertainty as to which of the two should truly command the army led to delays and the need to refer decisions to Louis XIV. Continued indecision led to French inactivity as messages travelled between the front and Versailles; the Allies were then able to take the initiative. The culmination of this was the Battle of Oudenarde, where the Duke of Burgundy's mistaken choices and reluctance to support Vendôme led to a decisive defeat for the French. In the aftermath of the defeat, his hesitation to relieve the Siege of Lille led to the loss of the city and thereby allowed the Allies to make their first incursions onto French soil.

The Duke of Burgundy was influenced by the dévots and was surrounded by a circle of people known as the faction de Bourgogne (Burgundy's faction), which was most notably made up of his old tutor Fénelon, his old governor Paul de Beauvilliers, Duke of Saint-Aignan and his brother-in-law Charles Honoré d'Albert, Duke of Chevreuse, as well as the renowned memorialist, Louis de Rouvroy, Duke of Saint-Simon.

These high-ranking aristocrats sought a return to a monarchy less absolute and less centralised, with more powers granted to the individual provinces. Their view was that government should work through councils and intermediary organs between the king and the people. These intermediary councils were to be made up not by commoners from the bourgeoisie (like the ministers appointed by Louis XIV) but by aristocrats who perceived themselves as the representatives of the people and would assist the king in governance and the exercise of power. Had the Duke of Burgundy succeeded to the throne, he might have applied this concept of monarchy.

Louis became Dauphin of France upon the death of his father in 1711. In February 1712, his wife contracted measles and died on February 12. Louis himself, who dearly loved his wife and who had stayed by her side throughout the fatal illness, caught the disease and died six days after her at the Château de Marly on 18 February, aged 29. Both of his sons also became infected. The elder, Louis, Duke of Brittany, the latest in a series of Dauphins, succumbed on 8 March, leaving his brother, the two-year-old Duke of Anjou, who was later to succeed to the throne as Louis XV.

Since, however, it was thought that the chances of survival of this frail child, now heir apparent to his seventy-four-year-old great grandfather, were minimal, a potential succession crisis loomed.

Moreover, overnight the broad hopes of the faction de Bourgogne were destroyed and its members would soon die of natural deaths. Nonetheless, some of their ideas were put into practice when, Philippe II, Duke of Orléans, as regent during Louis XV's minority, created a form of government known as polysynody, where each ministry was replaced by a council composed of aristocrats. However, the absenteeism, ineptitude and squabbling of the aristocrats caused this system to fail, and it was soon abandoned in 1718 in favour of a return to absolute monarchy.