Dumoulin is a surname of French origin. People with that name include:

• Brian Dumoulin (b. 1991) - an American ice hockey player
• Charles Dumoulin (1500–1566) - a French jurist
• Charles Dumoulin (1768–1825) - a French general
• Clément Adrien Vincendon-Dumoulin (1811–1858) - a French hydrographer
• Cyril Dumoulin (b. 1984) - a French handball player
• David Dumoulin (16??–after 1751) - a French dancer, The Royal Academy of Dance (Paris)
• François Aimé Louis Dumoulin (1753–1834) - a Swiss painter and engraver
• Franck Dumoulin (b. 1973) - a French pistol shooter
• Gabriel Dumoulin (b. 1975) - a French comic book author
• Georges Dumoulin (1877–1963) - a French politician
• Georges Dumoulin (b. 1934) - a French director
• Gilles-Maurice Dumoulin (1924–2016) - a French science fiction writer
• Maxime Dumoulin (1893–1972) - a French composer
• Marcel Dumoulin (1905–1981) - a French weightlifter
• Nicolas Dumoulin (b. 1985) - a Canadian ice hockey player
• Olivier Dumoulin - a French historian
• Pierre Du Moulin (1568–1658) - a French theologian, a minister of the Huguenot church in Paris and Charenton
• Pierre Charles Dumoulin (1749–1809) - a French general
• Roméo Dumoulin (1883–1944) - a Belgian painter and engraver
• Samuel Dumoulin (b. 1980) - a French road bicycle racer
• Tom Dumoulin (b. 1990) - a Dutch road bicycle racer