Dear Colleagues, A Special Issue of Diversity (ISSN 1424-2818; IF 3.029) has been launched devoted to the publication of studies on the Biodiversity and Evolution of Parasites of Marine Mammals. I invite you to contribute to this Special Issue with your latest research. For further information please follow the link to the Special Issue website at: https://www.mdpi.com/journal/diversity/special_issues/33A30372L9 <https://www.mdpi.com/journal/diversity/special_issues/33A30372L9>. Parasites of marine mammals have an intrinsic and instrumental value, but also a potential pathogenic impact on host populations. Bacteria, viruses, protozoans and metazoans broadly constitute the parasite diversity among marine mammals. The tight linkage between host and parasites makes them a suitable model for studying the ecology, systematics, evolution and biogeography between organisms. Therefore, we would like to provide with this Special Issue as a space for the publication of a range of studies on the diversity and evolution of parasites of marine mammals. We aim to revise and illustrate all levels of diversity and evolution of marine mammal parasites allowing a broad discussion in what we know and what we need to focus on in the following years. The scope includes, but is not limited to, the following fields: species diversity and distribution, genetic diversity, evolutionary history, parasites as tags for natural host populations, pathogenicity and disease. Studies using traditional and advanced diagnostic methods are welcome. We look forward to hearing from you, Kindest regards, Natalia Guest Editor ______________________________________________________________ Natalia Fraija Fernández Researcher - Marine Zoology Unit, University of Valencia. Phone: (9635) 43685 Scientific Associate - Department of Life Sciences, Natural History Museum