The transformation of Moravian Ostrava during the Nazi occupation highlights typical characteristics and specificities in the development of municipal administration in the Protectorate of Bohemia and Moravia.The situation in Moravian Ostrava can thus serve as an example of the illusory nature of declared administrative autonomy. The most significant event in the administrative development of Moravian Ostrava during the occupation was its connection with surrounding municipalities. The original intention to create a real Greater Ostrava was realized under new circumstances through the directive decision of the occupying power.