Wilhelmshaven is a coastal town in Lower Saxony, Germany. It is situated on the western side of the Jade Bight, a bay of the North Sea, and has a population of 76,089. Wilhelmshaven is the centre of the "Jade Bay" business region and is Germany's main military port.

The Jade Bight is a bight or bay on the North Sea coast of Germany. It was formerly known simply as Jade or Jahde. Because of the very low input of freshwater, it is classified as a bay rather than an estuary.