Xavier Ros Oton (Barcelona, 1988) is a Spanish mathematician[1] who works on partial differential equations (PDEs).

[5] He earned his Bachelor's and master's degree at the Universitat Politècnica de Catalunya in 2010 and 2011, and completed his PhD in 2014 under the supervision of Xavier Cabré.

He then moved to the University of Texas at Austin, where he was an R. H. Bing Instructor, and worked with Alessio Figalli and Luis Caffarelli.

He is a member of the editorial board of scientific journals, including Calculus of Variations and Partial Differential Equations and Collectanea Mathematica.

Awarded twice for the articles "Generic regularity of free boundaries for the obstacle problem" [19] and "Stable solutions to semilinear elliptic equations are smooth up to dimension 9".