Pierre Barrois (30 October 1774 – 19 October 1860) became a French division commander during the Napoleonic Wars. He joined a volunteer battalion in 1793 that later became part of a famous light infantry regiment. He fought at Wattignies, Fleurus, Aldenhoven, Ehrenbreitstein and Neuwied in 1793–1797. He fought at Marengo in 1800. He became colonel of a line infantry regiment in 1803 and led it at Haslach, Dürrenstein, Halle, Lübeck and Mohrungen in 1805–1807. Promoted to general of brigade, he led a brigade at Friedland in 1807.