The Clemens Sels Museum Neuss is notable for the diversity of its collection, which encompasses a broad spectrum of the history of art and culture. A prominent position is occupied by the art collection. Alongside major paintings from the Middle Ages and by 17th century Dutch painters, the works by the Nazarenes, Pre-Raphaelites and Symbolists make it a collection unique in Germany. Also represented are the Rhineland Expressionists with a superb selection of paintings, prints and stained glass. Additionally the Museum has comprehensive holdings of paintings and sculptures by Naïve artists who occupy an entirely distinct position within the art of the 20th century. In the area of contemporary art color painting is another focus of the Museum’s collection. Other sections give insight into pre- and early modern history, the historical and economic development of the city of Neuss and the rise of regional bourgeois culture. The archaeological department has fascinating finds from the Roman military camp in Neuss that was built in 16 BC. The collections are housed in two connecting buildings, the Obertor and the Deilmann Building, which is re-opening in 2015 after extensive renovations.

The Feld-Haus was opened in 2010 as an annex of the Clemens Sels Museum Neuss. It is located on Kirkeby-Feld between the missile base and the Insel Hombroich ensemble. The building, designed by Per Kirkeby as an architectural sculpture, houses one of the few museums especially devoted to popular imagery, and the only one in North Rhine-Westphalia. The collection began with more than 5,000 objects collected by Dr. Irmgard Feldhaus (1920–2010). The longtime director of the Clemens Sels Museum Neuss built up the art historical collections of the museum, in particular acquiring works by the Pre-Raphaelites, Symbolists and the Nabis before other German museums discovered these artists. In private life she was an avid collector of popular prints. She donated her extensive collection to the city of Neuss and it formed the foundation for the establishment of the Feld-Haus. Popular Imagery is the term used for graphic prints that were brought out in large numbers for a broad section of the population, such as devotional images, greeting cards, friendship and calling cards, printed wall paintings, broadsheets with illustrated narratives, cardboard sheets for handi crafts, paper crèches, broadsheets with pictures of current events, paper games and much more. The Feld-Haus invites visitors to explore these worlds of pictures. The collection focuses particularly on the 18th and 19th centuries, giving fascinating insights into the cultural history of that period. Multimedia stations provide more infor mation on the objects and themes. Alongside the permanent collection, two or three special exhibitions can be seen every year. The Feld-Haus collection is available for perusal by collectors and researchers on request.