Guillaume Lacroix (born 11 February 1976) is a French politician serving as president of the Radical Party of the Left since 2019.

[1] He has been a member of the Regional Council of Auvergne-Rhône-Alpes since 2021, and served as vice president of the Departmental Council of Ain from 2008 to 2015.

[2] In the 2012 legislative election, he was a candidate for Ain's 4th constituency.

[3]