Pierre Nicolas Gerdy (1 May 1797 - 18 March 1856) was a French physician who was a native of Loches-sur-Ource.
He was a professor with the Faculty of Medicine in Paris, and worked with renowned surgeons such as Jacques Lisfranc de St. Martin (1790-1847), Armand Velpeau (1795-1867) and Guillaume Dupuytren (1777-1835). The famed anatomist Paul Broca (1824-1880) was an assistant to Gerdy for a few years during the 1840s.
Gerdy was known for contributions as a surgeon, anatomist, pathologist and physiologist. He also worked with artists and sculptors, and in 1829 published Anatomie des formes extérieures du corps humain, appliqué à la peinture, à la sculpture et à la chirurgie, a book of anatomy as it applied to sculpture, painting and surgery. His name is associated with a number of anatomical eponyms, however most of these terms have since been replaced by clinical nomenclature: