The State of Mecklenburg was a subdivision of the Soviet occupation zone and one of the states of East Germany which corresponds widely to the present-day German state Mecklenburg-Vorpommern. The state was originally formed as an administrative division, the State of Mecklenburg-Vorpommern, by the Soviet Military Administration in Germany (SMAD) in July 1945. It consisted of the 1934-established Mecklenburg and parts of the former Prussian provinces of Pommern and Hanover. The city of Swinemünde was handed over to Poland in October 1945, becoming part of Szczecin Voivodeship. In November 1945, a transfer of small territories along the Inner German border to the former Province of Schleswig-Holstein was carried out as part of the Barber–Lyashchenko Agreement. About 2.1 million people were estimated to live in Mecklenburg in 1946. From 1947, the term Vorpommern was excluded from the official name as the SMAD feared that this would support revisionist actions against formerly German parts of Poland. Compared to the administrative divisions of Nazi Germany, Mecklenburg comprised the Gaue Mecklenburg and parts of Pomerania and Eastern Hanover.

The Soviet occupation zone in Germany was an area of Germany that was occupied by the Soviet Union as a communist area, established as a result of the Potsdam Agreement on 1 August 1945. On 7 October 1949 the German Democratic Republic (GDR), commonly referred to in English as East Germany, was established in the Soviet occupation zone.