Claire Mathieu (formerly Kenyon, born 1965^[1]) is a French computer scientist and mathematician, known for her research on approximation algorithms, online algorithms, and auction theory. She works as a director of research at the Centre national de la recherche scientifique.^[2]

Mathieu earned her Ph.D. in 1988 from the University of Paris-Sud, under the supervision of Claude Puech.^[3] She worked at CNRS and ENS Lyon from 1991 to 1997, at Paris-Sud from 1997 to 2002, at the École Polytechnique from 2002 to 2004, and at Brown University from 2004 to 2011 before returning to CNRS in 2012.^[2][4]

She was an invited speaker at the 2014 International Colloquium on Automata, Languages and Programming^[5] and at the 2015 Symposium on Discrete Algorithms.^[6] She won the CNRS Silver Medal in 2019.^[7] In 2020, she became a Chevalier of the Légion d'honneur.