The Neumark (listen ), also known as the New March (Polish: Nowa Marchia) or as East Brandenburg (German: Ostbrandenburg ), was a region of the Margraviate of Brandenburg and its successors located east of the Oder River in territory which became part of Poland in 1945.

Neumark or East Brandenburg
Neumark or Ostbrandenburg (de)
Nowa Marchia (pl)
Terra trans Oderam (la)
Region of the Margraviate of Brandenburg

Coat of arms of Brandenburg, shared by the Neumark

The Margraviate of Brandenburg c. 1320, showing the Neumark as the portion reaching out to the east. Cross-hatched are territories also acquired by the House of Ascania outside of Brandenburg.
Historical eraMiddle Ages,
Modern era
 Pawned to the Teutonic Knights
 Partitioned to form Brandenburg-Küstrin
 Electors inherited Duchy of Prussia
 Expanded on abolition of Posen-West Prussia
 Potsdam Conference awarded most of Neumark to Poland
17 July – 2 Aug 1945
1 January 1999
Preceded by
Succeeded by
Lubusz Land
Lubusz Voivodeship
Today part of
a: Pawned to the Teutonic Knights in 1402, who gained complete control of the territory by 1429. Pawned back to Brandenburg in 1455, whose reacquisition of the territory was completed in 1463.

Called the Lubusz Land while part of medieval Poland, the territory later known as the Neumark gradually became part of the German Margraviate of Brandenburg from the mid-13th century. As Brandenburg-Küstrin the Neumark formed an independent state of the Holy Roman Empire from 1535 to 1571; after the death of the margrave John, a younger son of Joachim I Nestor, Elector of Brandenburg, it returned to Elector John George, the margrave's nephew and Joachim I Nestor's grandson. With the rest of the Electorate of Brandenburg, it became part of the Kingdom of Prussia in 1701 and part of the German Empire in 1871 when each of those states first formed. After World War I the entirely ethnic German Neumark remained within the Free State of Prussia, itself part of the Weimar Republic (Germany).

After World War II the Potsdam Conference assigned the majority of the Neumark to Polish administration, and since 1945 has remained part of Poland. Polish settlers largely replaced the expelled German population. Most of the Polish territory became part of the Lubusz Voivodeship, while the northern towns Choszczno (Arnswalde), Myślibórz (Soldin), and Chojna (Königsberg in der Neumark) belong to the West Pomeranian Voivodeship. Some territory near Cottbus, which was administratively part of the Government Region of Frankfurt (coterminous with the Neumark) after the 1815 Congress of Vienna, became part of East Germany in the 1940s, becoming part of Germany after reunification in 1990.

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