The 1997 Central European flood or the 1997 Oder Flood of the Oder and Morava river basins in July 1997 affected Poland, the Czech Republic and Germany, taking the lives of 114 people and causing material damages estimated at $4.5 billion. The flooding began in the Czech Republic, then spread to Poland and Germany. In Poland, where it was one of the most disastrous floods in the country's history, it was named the Millennium Flood. The term was also used in Germany (Jahrtausendflut). The event has also been referred to as the Great Flood of 1997.

The Morava is a river in Central Europe, a left tributary of the Danube. It is the main river of Moravia, which derives its name from it. The river originates on the Králický Sněžník mountain in the north-eastern corner of Pardubice Region, near the border between the Czech Republic and Poland and has a vaguely southward trajectory. The lower part of the river's course forms the border between the Czech Republic and Slovakia and then between Austria and Slovakia.