Moulin and du Moulin are French-language surnames. "Moulin" literally means "mill".

The surname may refer to:

• Arthur Moulin (1924–2017), French politician
• Chris Moulin, English psychologist
• Félix-Jacques Moulin (1802–1875), French photographer
• Ginette Moulin (1927–2025), French businesswoman
• Henry du Moulin de Labarthète (1900–1948), French senior civil servant and diplomat
• Hervé Moulin (born 1950), French economist
• Hippolyte Moulin (1832–1884), French sculptor
• Jean Moulin (1899–1943), member of the French Resistance during World War II
• Jean-François-Auguste Moulin (1752–1810), French military officer and political leader
• Jeanine Moulin (1912–1998), Belgian poet
• Jessy Moulin (born 1986), French football player
• Lewis Du Moulin, French Huguenot physician and controversialist, son of Pierre
• Marc Moulin (1942–2008), Belgian musician
• Marjatta Moulin (1926–2018), Finnish fencer
• Peter du Moulin, French-English Anglican clergyman and author, son of Pierre
• Peter Ludwig du Moulin, (1681–1756), Prussian general
• Pierre Moulin, French historian
• Pierre Du Moulin (1568–1658), Huguenot minister and author in France
• Pierre Moulin du Coudray de La Blanchère (1821–1880), French photographer
• Stéphane Moulin (born 1967), French football player
• Thibault Moulin (born 1990), French football player