Königsberg (until 1946 officially: Königsberg in Preußen) was a city in the monastic state of the Teutonic Knights, the Duchy of Prussia, the Kingdom of Prussia and Germany until 1946. After being largely destroyed in World War II and occupied by the Soviet Union thereafter, the former city was renamed Kaliningrad, and few traces of the former Königsberg remain today.

The literal meaning of Königsberg is 'King's Mountain'. In the local Low German dialect, spoken by many of its German former inhabitants, the name was Königsbarg (pronounced [ˈkʰeˑnɪçsbɒɐç]). Further names included Russian: Кёнигсберг (Kyonigsberg), Old Prussian: Kunnegsgarbs, Knigsberg, Lithuanian: Karaliaučius and Polish: Królewiec.

Königsberg was founded in 1255 on the site of the ancient Old Prussian settlement Twangste by the Teutonic Knights during the Northern Crusades, and was named in honour of King Ottokar II of Bohemia. A Baltic port, the city successively became the capital of their monastic state, the Duchy of Prussia (1525-1701) and East Prussia (until 1945). Königsberg remained the coronation city of the Prussian monarchy though the capital was moved to Berlin in 1701. It was the easternmost large city in Germany until it was captured by the Soviet Union on 9 April 1945, near the end of World War II.

The 435 m high Königsberg is a hill in the Harz mountains in central Germany, southwest of Goslar between the Grane Reservoir and the Steinberg. On its summit are the ruins of an old tuberculosis convalescent home, later a children's home, the Königsberg Sanatorium.

The Königsberg is a neighbouring peak of the Brocken and, at 1034 m above sea level the third highest elevation in the Harz mountains. It lies on a long ridge that runs from southeast to northwest about 1.5 km south of the Brocken's summit.

The mountain is located in the heart of the national park and is out-of-bounds to walkers. Formerly two paths ran to the top:

There are several striking granite crags on the ridge. From east to west they are the: