Vaillant is a surname. Notable people with the surname include:
Artists of the Dutch Golden Age
Andries Vaillant (1655–1693), engraver and painter
Bernard Vaillant (1632–1698), painter
Jacques Vaillant (painter)
Jan Vaillant (1627–1668), painter
Wallerant Vaillant, painter
Politics
Daniel Vaillant (1949– ), French socialist politician
Édouard Vaillant (1840–1915), prominent French socialist
Auguste Vaillant, French anarchist
Science and medicine
François Le Vaillant, French explorer and ornithologist
George Clapp Vaillant, American anthropologist
George Eman Vaillant, American psychiatrist
Léon Vaillant, French zoologist
Louis Vaillant (1874–?), French doctor, naturalist, explorer and soldier
Sébastien Vaillant, French botanist
Other
André Vaillant (1890–1977), French linguist and Slavist
Auguste-Nicolas Vaillant (1793-1858), French naval officer
François Vaillant de Gueslis, French Jesuit missionary
Greta Vaillant (?–2000), French actress
Jean Alexandre Vaillant, French and Romanian historian and schoolteacher
Jean-Baptiste Philibert Vaillant, French soldier
Jehan Vaillant (fl. 1360–1390), French composer
John Vaillant (fl. 2005–), Canadian author
Nigel Le Vaillant, British actor
Pierre Henri Vaillant (1878-1939), French painter
Fictional characters:
Michel Vaillant, a comic book character
