The Senckenberg group of research institutes and museums is internationally known for its huge diversity of scientific collections, based on the long, independent histories of these institutes. In the Frankfurt institute several important micropalaeontological collections are held, including the Foraminifera (Protozoa) Collection described here. The oldest catalogued foraminifera material dates from Reuss (1863), and the collection has been substantially increased since the first catalogue (Kinkelin, 1903), and especially since 1936 with major collections of Franke, Bartenstein and Brand (Mesozoic of western Europe especially Germany), Kristan-Tollmann (Triassic worldwide), and the Kahler Fusulinid Collection. There are currently 1332 type specimens of which 357 are primary types. The collections were moved to new accommodation in 2018, with primary types stored in two fire-proof safes and other types and background material in nine dedicated modern roller-cabinets.