Jacques Rosenbaum (full name: Jacques Gustav-Adolf Rosenbaum-Ehrenbush) (1 July 1878 in Haapsalu, Estonia, former Russian Empire – 6 January 1944 in Berlin, then Nazi Germany)[1] was an Estonian architect of Baltic German descent. Between 1904 and 1907 he served as municipal architect of Tartu, Estonia, and is best known for his Art Nouveau buildings in Tallinn.