Achille Valenciennes (9 August 1794 – 13 April 1865) was a French zoologist.
Valenciennes was born in Paris, and studied under Georges Cuvier. His study of parasitic worms in humans made an important contribution to the study of parasitology. He also carried out diverse systematic classifications, linking fossil and current species.
He worked with Cuvier on the 22-volume "Histoire Naturelle des Poissons" (Natural History of Fish) (1828–1848), carrying on alone after Cuvier died in 1832. In 1832, he succeeded Henri Marie Ducrotay de Blainville (1777–1850) as chair of Histoire naturelle des mollusques, des vers et des zoophytes at the Muséum national d´histoire naturelle.
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