Berlin: Mayors: 1945-1948 - Archontology
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Berlin: Mayors: 1945-1948

Oberbürgermeister der Stadt Berlin
17 May 1945 - 20 Oct 1946 Arthur Werner
Oberbürgermeister von Groß-Berlin
20 Oct 1946 - 10 Dec 1946 Arthur Werner 
10 Dec 1946 - 11 Jun 1947 Otto Ostrowski [1]
11 Jun 1947 - 7 Dec 1948 office vacant [2]

[1] Ostrowski was elected and sworn in 5 Dec 1946 at the session of the City Council Assembly (Stadtverordnetenversammlung), but was prevented from taking office until the approval of the resignation of his predecessor, Werner, by the Allied Kommandatura of Groß-Berlin (Alliierte Kommandatura) 10 Dec 1946.
[2] Designated substitute without formal appointment to the office: Bürgermeister Louise Dorothea Sophie Schroeder (acting for the incumbent 8 May 1947 - 11 Jun 1947; 24 Jun 1947 - 18 Aug 1947 pending the installation of Ernst Rudolf Johannes Reuter in the office of Oberbürgermeister von Groß-Berlin who is elected 24 Jun 1947, but not approved by the Allied occupation authorities)