Pierre Lemonnier (Saint-Sever, 28 June 1675 – Saint-Germain-en-Laye, 27 November 1757) was a French astronomer, a Professor of Physics and Philosophy at the Collège d'Harcourt (University of Paris), and a member of the French Academy of Sciences.
Lemonnier published the 6-volume Latin university textbook Cursus philosophicus ad scholarum usum accommodatus (Paris, 1750/1754) which consisted of the following volumes (generally consistent with the Ratio Studiorum):
- Volume 1 - Logica
- Volume 2 - Metaphysica
- Volume 3 - Physica Generalis including mechanics and geometry
- Volume 4 - Physica Particularis (Part I) including astronomy (Ptolemaic, Copernican, Tychonic), optics, chemistry, gravity, and Newtonian versus Cartesian dynamics
- Volume 5 - Physica Particularis (Part II) including fluid mechanics, human anatomy, magnetism, and miscellaneous subjects (earthquakes, electricity, botany, metallurgy, etc. ...)
- Volume 6 - Moralis including appendices on trigonometry and sundials
He was also the father of Pierre Charles Le Monnier and Louis Guillaume Le Monnier.