Geoffroy Saint-Hilaire may refer to:
- Étienne Geoffroy Saint-Hilaire (1772-1844), French naturalist
- Isidore Geoffroy Saint-Hilaire (1805-1861), French zoologist who coined the term ethology, son of Étienne Saint-Hilaire
- Albert Geoffroy Saint-Hilaire (1835-1919), French zoologist, coined the binomial nomenclature name for the Chinese Monal pheasant, son of Isidore Saint-Hilaire