Bielefeld is a city in the Ostwestfalen-Lippe Region in the north-east of North Rhine-Westphalia, Germany. With a population of 336,352, it is also the most populous city in the Regierungsbezirk Detmold.
The historical centre of the city is situated north of the Teutoburg Forest line of hills, but modern Bielefeld also incorporates boroughs on the opposite side and on the hills.
Bielefeld is home to a significant number of internationally operating companies, including Dr. Oetker, Gildemeister and Schüco. It has a university and several Fachhochschulen. Bielefeld is also famous for the Bethel Institution, and for the Bielefeld Conspiracy, which satirises conspiracy theories by claiming that Bielefeld does not exist. This concept has been used in the town's marketing and alluded to by Chancellor Angela Merkel.