Louis Lémery (25 January 1677, Paris, France – 9 June 1743, Paris) was a French botanist and chemist.^[1]

The son of scientist Nicolas Lemery, Louis was appointed physician at the Hôtel-Dieu de Paris in 1710, and became chemistry chair at the Jardin du Roi in 1730, succeeding Étienne François Geoffroy.^[1] He was the author of a Traité des aliments (1702), and of a Dissertation sur la nature des os (1704), as well as of a number of papers on chemical topics.^[1] He published papers on chemical analysis, monstrous births (birth defects) and the anatomy of fetuses.^[1]

In 1706, he married Catherine Chapot, with whom he had one daughter.^[1]