Fabio Toninelli (born 1975) is an Italian mathematician who works in probability theory, stochastic processes and probabilistic aspects of mathematical physics.

Between 2004 and 2020 he was senior researcher at Centre National de la Recherche Scientifique (CNRS) in Lyon.

[1] He is currently (2021–2024) co-editor-in-chief (jointly with Bálint Tóth) of the journal Probability Theory and Related Fields.

[2] Toninelli has contributed substantially to the mathematical theory of disordered statistical mechanical systems, mixing of Markov chains, dimer models.

His most significant contributions concern the theory of mean-field spin glasses, of polymers in random environments and of stochastic interface dynamics.