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Frankfurt (Oder), also known as Frankfurt an der Oder (German: [ˈfʁaŋkfʊʁt ʔan deːɐ̯ ˈʔoːdɐ], lit. 'Frankfurt on the Oder'; Central Marchian: Frankfort an de Oder, Polish: Frankfurt nad Odrą) is the fourth-largest city in the German state of Brandenburg after Potsdam, Cottbus and Brandenburg an der Havel. With around 58,000 inhabitants, it is the largest German city on the Oder River, and one of the easternmost cities in Germany. Frankfurt sits on the western bank of the Oder, opposite the Polish town of Słubice, which was a part of Frankfurt until 1945, and called Dammvorstadt until then. The city is about 80 kilometres (50 mi) east of Berlin, in the south of the historical region Lubusz Land. Within Frankfurt's city limits lies the recreational area Lake Helenesee.
The name of the city makes reference to the Franks, and means Ford of the Franks, and there appears a Gallic rooster in the coats of arms of Frankfurt and Słubice. The official name Frankfurt (Oder) and the older Frankfurt an der Oder are used to distinguish it from the larger city of Frankfurt am Main.