The International Workshop on Retroviral Pathogenesis (RetroPath), now in its 31st year, has long served as an active forum for the exchange of new research findings and concepts on all aspects of retroviral pathogenesis. RetroPath is the only meeting that brings diverse researchers, young and highly experienced, together to discuss on retroviruses infecting a wide variety of host species including birds, rodents, cats, ungulates and primates. It focuses on multiple aspects of retrovirus biology, starting with basic biology to pathogenic and oncogenic potential, endogenous retroviruses and their role in disease pathogenesis, host restriction factors, emerging retroviruses, vaccines, and gene therapy vectors.