Garden city theory was introduced by Ebenezer Howard. Many architects and theorists transformed and applied this theory in their designs. Garden City began in England but there was no example of the Ebenezer Howard theory. With the effects of industrial revolution, cities emerged, there was a problem about the planning so the garden city was the ideal of a planned residential community. After the first war, especially in Germany, there were problems with dwellings and their hygiene. Workers need a house so in Germany especially in Berlin garden city was transformed to Siedlung. Bruno Taut, J.J. Oud, and Martin Wagner were well-known architects of Berlin Siedlungs. Siedlung spread Europe in Vienna there were crucial examples of Siedlung. We discussed Garden City and Siedlung basics and introduced several examples from Berlin, Frankfurt, and Vienna.