District 9 is a southern city district of Düsseldorf, the state capital of North Rhine-Westphalia, Germany. The district covers an area of 36.57 square kilometres and has approximately 94,000 inhabitants, making it the city's second most populous district after District 3.
The district borders Düsseldorf Districts 3 and 8 to the north, and 10 to the south. To the east and west the district borders the rural districts of Kreis Mettmann and Rhein-Kreis Neuss respectively.