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. Wilhelmshaven is the centre of the "JadeBay" business region (which has around 330,000 inhabitants) and is Germany's main military port.

The adjacent Lower Saxony Wadden Sea National Park (part of the Wattenmeer UNESCO World Natural Heritage Site) provides the basis for the major tourism industry in the region.

Sights include:

• The Jadestadion, the stadium of Regionalliga Nord club SV Wilhelmshaven
• Aquarium Wilhelmshaven, located on the Helgolandkai - a view of the oceans and underwater habitats around the world.
• The Botanischer Garten der Stadt Wilhelmshaven, a municipal botanical garden.
• The Deutsches Marinemuseum (Navy Museum), whose main exhibits are the former German Navy destroyer Mölders (D186), a submarine, and some smaller warships as well as an exhibition of German naval history from the 19th century onwards.
• UNESCO World Heritage Site Wadden Sea Visitor center. The large permanent interactive exhibition provides insight into the wadden sea environment. One of the special displays is the 14-metre-long skeleton of a sperm whale which beached on the island of Baltrum in 1994 and weighed 39 tonnes when alive. The whale's organs were plastinized by Gunther von Hagens.
• The Küstenmuseum (Coastal Museum). The exhibition displays a broad spectrum of the past, present and future of the coast.
• The Bontekai, city harbor jetty, featuring the former light vessel "Weser" and the steam engine powered buoy layer "Kapitan Meyer", an active museum ship. During the "Jade Weekend" (late June) it is berth of tall sailing ships, too.
• The double swing bridge Kaiser-Wilhelm-Brücke ("Emperor Wilhelm Bridge") crosses an inlet of the Jade Bight. It was built from 1905 to 1907 and is considered to be Wilhelmshaven's landmark.
• The Town Hall (Rathaus), a large brick building, constructed from 1927 to 1929 by the architect Fritz Höger as the town hall of the city of Rüstringen.
• The oldest church of the city is the St Jakobi Church at Neuende which was built in about 1383 under the direction of the chieftain of Jever Edo Wiemken. The Christus-und-Garnisionskirche, was built centuries later in 1869 by the Prussian architect Friedrich Adler.
• Kaiser-Wilhelm-Denkmal at the Friedrich-Wilhelm-Platz, a monument erected in memory of emperor Wilhelm I of Prussia in 1896, who was one of the founder of the city. After the statue had been melted down in 1942, it was reconstructed in 1994.
• The entrance building of the former Kaiserliche Marinewerft ("emperor's shipyard"), built in the 1870s.
• The building of the former Kaiserliche Westwerft ("emperor's western shipyard"), completed in 1913.
• Every year in the first days of July, the big "Weekend on the Jade" event attracts hundreds of thousands of visitors to the big port, the southern beach and the navy arsenal. Another big event takes place at the end of the sailing season at the beginning of October when two dozen large sailing ships dock in Wilhelmshaven as part of the "JadeWeserPort Cup".