French military surgeon in the service of Napoleon; he introduced field hospitals, ambulance service, and first-aid practices to the battlefield.

Larrey began his medical studies with his uncle in Toulouse and, in 1787, traveled to North America. Returning to Paris, he continued his studies and during the Revolution, in 1792, was attached to the Army of the North. He eventually became principal surgeon of the French Army and thereafter followed Napoleon Bonaparte in almost all his campaigns—in Egypt, in Italy, in Germany and Austria, in Russia, and, finally, at Waterloo. Napoleon made him baron of the empire. After the fall of Napoleon, Larrey's medical reputation saved him, and he was named a member of the Académie de Médicine at its founding in 1820. Larrey was the first to note the contagiousness of trachoma (1802) and published the first description of trench foot (1812).