| Honorific Prefix: | Baron |
| Pierre Paulus | |
| Honorific Suffix: | de Châtelet |
| Birth Date: | 1881 3, df=yes |
| Birth Place: | Châtelet, Belgium |
| Death Place: | Brussels, Belgium |
| Movement: | Expressionism |
| Notable Works: | Flag of Wallonia |
| Relatives: | Pierre Binetter |
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" (fr|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.