Guido de Philippis (born 16 August 1985 in Fiesole, Italy) is an Italian mathematician. He works on the calculus of variations, partial differential equations and geometric measure theory.
In 2016 he was awarded the EMS Prize, "for his outstanding contributions to the regularity of solutions of Monge–Ampère equation and optimal maps and for his deep work on quantitative stability inequalities for the first eigenvalue of the Laplacian and rigidity in some isoperimetric type inequalities."
De Philippis was a Ph.D. student of Luigi Ambrosio and Luis Caffarelli.