Robert V. Kohn (born in 1953) is an American mathematician working on partial differential equations, calculus of variations, mathematical materials science, and mathematical finance.

He is a professor at the Courant Institute of Mathematical Sciences, New York University.

[1] Kohn studied mathematics at Harvard University, obtaining his bachelor's degree in 1974.

[2][3] Kohn is best known for his work on non-linear partial differential equations, including work with Louis Nirenberg and Luis Caffarelli in which they obtained partial results about the regularity of weak solutions of the Navier–Stokes equations.

[5] In 2006, he was a plenary speaker at the International Congress of Mathematicians, in Madrid (Energy driven pattern formation).