Vasseur is a French surname, a shortened form of French: vavasour, a feudal title below the baron. Vassar is its anglicized version. Notable people with the Vasseur surname include:

• Adolphe Bazaine-Vasseur (1809–1893), French railway engineer
• Alain Vasseur (born 1948), French cyclist
• Alexis Vasseur, French-American mathematician
• Cédric Vasseur (born 1970), French cyclist, son of Alain
• Dominique Henri Vasseur (born 1951), French-American art museum curator
• Flore Vasseur (born 1973), French filmmaker, novelist, journalist and entrepreneur
• Frédéric Vasseur (born 1968), French motor sport engineer
• Gaston Vasseur (1904–1971), French linguist
• Isabelle Vasseur (born 1959), member of the National Assembly of France
• Jean-Luc Vasseur (born 1969), French football manager
• Leo Vasseur, Canadian politician
• Léon Vasseur (1844–1917), French composer, organist and conductor
• Louis Vasseur (1885–1968), French athlete
• Noel Le Vasseur (1798–1879), trader and merchant from Canada
• Paul Vasseur (1884–1971), French swimmer and water polo player
• Peter Le Vasseur (born 1938), artist from Guernsey
• Philippe Vasseur (born 1943), French politician