The one-ton US-made bomb was found in Düsseldorf during construction work near the city’s zoo.
The bomb is to be defused during the night of Tuesday.
Unexploded bombs from the Second World War are regularly found in Germany, 78 years after the end of the war.
In 2017, a 1.4-ton undetonated bomb was discovered in Frankfurt, which resulted in the evacuation of 65,000 people.
In December 2021, a bomb exploded in Munich while drilling in a construction project at a bridge near Munich Central Station. Four people were injured.