Urbain J. Ledoux (August 13, 1874 – April 8, 1941), later known as "Mr. Zero", preferring his own name not to be prominent, was an American diplomat and activist with a declared interest in the Baháʼí Faith. He then began to found humanitarian organisations. He first made news seeking to help with unemployment after the First World War among workers and veterans on the breadline. He advocated for the Baháʼí Faith, albeit with a limited understanding of the principles of the religion. Ledoux set up events aimed at raising awareness of the suffering of the unemployed in New York and Boston.