Frankfurt (Oder) is a town in Brandenburg, Germany, located on the west side of the Oder River, on the Germany-Poland border, about 80 kilometres east of Berlin.
The town's recorded history began in the 13th century as a West Slavic settlement. During its history, it was successively part of the Kingdom of Poland, the Margraviate of Brandenburg, the Bohemian Crown, Prussia and Germany. After World War II, the eastern part of Frankfurt became part of Poland under the terms of the Potsdam Agreement and was renamed to Słubice, while the western part became a border town of the German Democratic Republic in 1949. During the communist era, Frankfurt reached a population peak with more than 87,000 inhabitants at the end of the 1980s. Following German reunification, the population decreased significantly, but has stabilized in recent years at about 58,000 inhabitants. As of 2020, the town plays an important role in German–Polish relations and European integration. It is home to the Viadrina European University.
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.