Barreau is a French surname. Notable people with the surname include:
Andre Barreau, musician Gaston Barreau (1883–1958), French football player and coach Gisèle Barreau (born 1948), French composer Jean-Claude Barreau (1933–2025), French essayist and writer Rose-Alexandrine Barreau (1773–1843), French soldier
See also François Dominique Barreau de Chefdeville (1725–1765), French architect Barrault, people bearing that surname