France

Robert Faurisson

Robert Faurisson (1929-2018) is surely one of the most famous denialist figure in France. He especially strongly denies the existence of gas chambers and the overall extermination of Jews during the second world war.

https://www.lemonde.fr/disparitions/article/2018/10/22/le-negationniste-robert-faurisson-est-mort_5372781_3382.html