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 Ostracoda Collection described here. The first catalogued ostracod material dates from 1903, since when the collection has been substantially increased, especially since 1939 thanks to the work of three full-time and one part-time dedicated scientists (Triebel, Malz, Jellinek, Lord), their collaborations, and the visitors that they and the collection attracted to Frankfurt. Other major collections relate to the work of Becker (Devonian), Krömmelbein (Lower Cretaceous, Brazil and West Africa; also Devonian) and Kristan-Tollmann (Triassic worldwide). The collections were moved to new accommodation in 2018, with primary types (currently 1247) stored in two fire-proof safes and other types and background material in nine dedicated modern roller-cabinets.