Desmarest is a French surname. Notable people with the surname include:
- Anselme Gaëtan Desmarest (1784–1838), French zoologist
- Eugène Anselme Sébastien Léon Desmarest (1816–1889), French zoologist and entomologist
- Henri Desmarest (or Desmarets) (1661–1741), French Baroque composer
- Marie-Anne Desmarest (1904–1973), French writer
- Nicolas Desmarest (1725–1815), French geologist
- Thierry Desmarest (born 1940), French businessman
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