The Festschrift Eugen Karl Kempf is a proceedings volume of the 15th International German Ostracodologists’ Meeting which was held October 11th to 14th, 2012 by the Institute of Geology and Mineralogy of the University of Cologne. The selected contributions cover a broad range of biological and palaeontological topics that rely on sound taxonomy and serve as a tribute to the Kempf Database of Ostracoda including a biography on Eugen Karl Kempf. In detail, the scientific contributions are covering freshwater and marine genera/species and the parasitic family Entocytherids. Revisions of genera and descriptions of new species are one focus, but also new studies on biogeography, ecology and morphology add to the value of the proceeding. Contributors are: Anja Adler, Qing-Chao Chen, Dan L. Danielopol, Laurent Decrouy, Martin Gross, Simon Hofmann, Dietmar Keyser, Khai-Zhi Li, Renate Matzke-Karasz, Claude Meisch, Francesc Mesquita-Joanes, Alexandre Mestre, Munef Mohammed, Juan S. Monrós, Nataša Mori, Christina Nagler, Tadeusz Namiotko, Werner E. Piller, Burkhard Scharf, Torsten W. Vennemann, Finn A. Viehberg, Claudia Wrozyna, Jian-Quian Yin, Dayou Zhai, Wanhe Zhao