Petit is a French-language surname literally meaning "small" or "little". Notable people with the surname include:

• Adriana Petit (born 1984), Spanish multidisciplinary artist
• Alexis Thérèse Petit (1791–1820), French physicist
• Amandine Petit (born 1997), French model, beauty pageant titleholder, and Miss France 2021
• Antoine Petit (1722–1794), French physician
• Antoni Martí Petit, prime minister of Andorra
• Cavelier Petit, American politician
• François Pourfour du Petit (1664–1741), French anatomist
• Henriette Petit (1894-1983), Chilean painter
• Jean-Martin Petit (1772–1856), French General during the Napoleonic Wars
• Monique Ruck-Petit (born 1942), Swiss and French chess master
• Paul Petit (aviator) (1890-1918), French flying ace
• Philippe Petit (born 1949), French high-wire artist
• Pierre Petit (photographer) (1832–1909), French photographer
• Pierre Petit (scholar) (1617–1687), French scholar, medical writer, and poet
• Pierre Petit (engineer), (1598–1677), French military engineer, mathematician, and physicist
• Pierre Petit (cinematographer) (1920–1997), French cinematographer
• Pierre Petit (composer) (1922–2000), French composer
• Pierre Petit (politician) (1930–2022), Martinique politician
• Pierre Petit (driver), (born 1957), French racecar driver
• Roland Petit (1924–2011), French choreographer and dancer
• The surname for a prominent Parsi family of India, whose members include:
  • Dinshaw Maneckji Petit, (1823–1901), Indian industrialist
  • His granddaughter Rattanbai Petit (1900–1929), wife of Jinnah, founder of Pakistan
• The Petit Family, 2007 Connecticut home invasion and murder victims
• John F. Petit (1887–1963), American businessman and politician
• John Louis Petit (1801–1868), English clergyman and architectural artist
• Rosa Petit, Venezuelan politician
• Sauveur Abel Aubert Petit de la Saussaye (1792–1870), French malacologist
• Yusmeiro Petit (born 1984), Venezuelan baseballer

• Emmanuel Petit (born 1970), former French midfielder, who played for France, Monaco, Arsenal, Barcelona and Chelsea
• Gonzalo Petit (born 2006), Uruguayan forward
• Petit (Portuguese footballer) (Armando Gonçalves Teixeira, born 1976), Portuguese midfielder
• Jean Petit (Belgian footballer) (1914—44), Belgian defender
• Jean Petit (footballer, born 1949) (born 1949), former French midfielder
• Paulinho Le Petit (born 1989), former Brazilian midfielder
• Petit Sory (born 1945), former Guinean forward
• René Petit (1899–1989), Franco-Spanish engineer and a footballer in his youth

• All pages with titles containing Petit