Pierre Paulus (1881–1959), later Baron Pierre Paulus de Châtelet, was a Belgian expressionist painter. He is best known as the designer of the "bold rooster" (French: coq hardi) adopted on 3 July 1913 as the symbol of the Walloon Movement and today the flag of Wallonia.^[1]

Paulus gained notability during the Walloon Art Exposition of Charleroi in 1911 and, in the interwar period, he held several exhibitions in Europe and in the United States.

• Delforge, Paul; Philippe Destatte; Micheline Libon (2001). Encyclopédie du mouvement wallon – Volume 3 : Lettres O – Z. Charleroi: Institut Jules Destrée. pp. 1244–1245. ISBN 978-2-87035-021-8.