Jean Denis (10 November 1902 – 10 March 1992) was a Belgian politician and writer. Through his written work he was the chief ideologue of the Rexist movement. A native of Chastre-Villeroux-Blanmont in Walloon Brabant, Denis was educated to doctorate level. He first became involved in politics with the radical Catholic movements, serving as secretary to Monsignor Louis Picard. Léon Degrelle had also been a member of Picard's Action Catholique de la Jeunesse Belge and it was that movement's publishing house, Éditions Rex, that inspired the name of Rexism. As such Denis was almost inevitably drawn to Rexism and he served as a deputy for Namur between 1936 and 1939.