Sparrenberg Castle, also known as the Sparrenburg, is a restored fortress in the Bielefeld-Mitte district of Bielefeld, Germany. It is situated on the Sparrenberg hill in the Teutoburg Forest and towers 60 metres (200 ft) above the city centre. Its current appearance mainly originated in the 16th and 19th century. The Sparrenburg is considered to be Bielefeld's landmark.

Bielefeld is a city in the Ostwestfalen-Lippe Region in the north-east of North Rhine-Westphalia, Germany. With a population of 341,755, it is also the most populous city in the administrative region of Detmold and the 18th largest city in Germany.