Oldenzaal is a municipality and a city in the eastern province of Overijssel in the Netherlands. It is part of the region of Twente and is close to the German border.
It received city rights in 1249. Historically, the city was part of the Hanseatic League as a subsidiary city of the fellow Hanseatic city of Deventer.
Located on the A1 motorway from Amsterdam to Germany, Oldenzaal also has a rail connection to Hengelo.
As of 1 January 2019, 31,885 people lived in Oldenzaal.
In the Netherlands, Oldenzaal is well known for its carnival festivities. During the carnival season Oldenzaal is known as "Boeskool-stad" which is a local dialect of the word Cabbage-town. During the main carnival weekend over 100,000 people come for the big parade showing high and mighty carnival trucks.