FOMU's image collection now consists of more than 900,000 images that illustrate the development of international photography and Belgian photography, in particular. The FOMU collects both historical and contemporary photography, art and documentary photography, as well as free and applied photography. The collection is also representative of the history of photography in terms of printing techniques and includes daguerreotypy, glass plates, autochromes, negatives, slide positives, contact prints and photo publications. In addition to international legends, it also contains a large number of leading Belgian names.
The collection started with the Association Belge de Photographie archives and those of the publication department of the company Gevaert. Over the years, the collection has made valuable acquisitions, such as part of Fritz L. Grüber's private collection, the Agfa-Gevaert Historical Archives and archives of Belgian photographers. The collection is still growing as the FOMU consistently purchases work by young Belgian talent and acquires images that tell the story of (Belgian) photography.