Deutsch-Vlämische Arbeitsgemeinschaft ("German-Flemish Working Group"), better known as DeVlag, was a pro-Nazi organization active in Flanders during the German occupation of Belgium. It was founded in 1936 by academics Jef Van de Wiele and Rolf Wilkening as a cultural association, with the purpose of strengthening the exchange of students and professors between the universities of Leuven and Cologne.Its membership reached hundreds by the late 1930s.