Longuet is a French surname. It may refer to :
- Charles Longuet, (1839–1903) a journalist and prominent figure in the French working-class movement
- Jenny Longuet (1844–1883) was the daughter of Jenny von Westphalen and Karl Marx and wife of Charles Longuet
- Jean Longuet (1876–1938), a French socialist, son of Jenny and Charles Longuet
- Gérard Longuet (b. 1946), French politician
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