Joseph Dejardin (21 March 1873 – 28 October 1932) was a Belgian trade unionist and politician.
Born in Grivegnée, Dejardin worked at a coal mine from the age of eleven.
He joined the Union of Mineworkers of Belgium and eventually rose to become its president.
[1][2] In 1903, Dejardin was elected as a councillor in Beyne-Heusay, and he served as mayor from 1914 to 1921.
[1] Dejardin's sister, Lucie, also became a politician.