Leuchtturm Arngast, Lighthouse in the Jade Bight, Lower Saxony, Germany

Leuchtturm Arngast is a 36.27-metre steel tower standing in open water on a sandbank in the Jadebusen, about 4.5 km southeast of Wilhelmshaven. Its shaft is red with a white band, and a red gallery railing and domed red roof crown the lantern room. The tower rests on a concrete base with a platform, metal railings and a short staircase.

Built in 1909 and 1910 to guide ships into Wilhelmshaven and through the Jadebusen, the tower rests on 112 wooden piles, each about 8 metres long and 30 centimetres thick. The steel structure cost around 200,000 marks. In 1975 and 1986 the piles were reinforced with a concrete casing.

The tower is one of the best known and most traditional lighthouses on the German North Sea coast, alongside Roter Sand. It was entered in the register of cultural monuments in 2003. Boat trips from Dangast and Wilhelmshaven circle it, often combined with the tanker jetties and naval harbour of Wilhelmshaven and the seal banks on the Jade.

The tower stands on a sandbank in open water about 4.5 km southeast of Wilhelmshaven and cannot be entered or reached on foot. Excursions by boat around the lighthouse can be booked from Dangast and Wilhelmshaven, often combined with the tanker jetties and naval harbour in Wilhelmshaven or the seal banks on the Jade.

Since 1966, the structure has been powered by a submarine cable from Dangast. This upgrade modernized the power supply and replaced the original diesel generator system entirely.