An account is given of the type-specimens (holotypes, lectotypes, neotypes, paratypes, paralectotypes, syntypes) of the Diptera families Fanniidae and Muscidae in the Museum fiir Naturkunde of the Humboldt-Universitat zu Berlin, Germany. Detailed information is given on the specimens, their labelling and their condition, and reference is made to parts of type-series located in other museums and institutes. 50 species of Fanniidae and 686 species of Muscidae are enumerated. The species are listed alphabetically, and the account concludes with a systematic nomenclatural summary, a geographic summary, an appendix listing the European localities cited in the text, and a bibliography. 22 lectotypes are designated. 13 are in Fanniidae