The pathogens and parasites of Chrysolina fastuosa (Scopoli, 1763) (Coleoptera: Chrysomelidae) were investigated. Two different types of pathogen and parasite were recorded in the adults of C. fastuosa: a gregarine belonging to the family Gregarinidae and a nematode parasite member of the family Mermithidae for the first time. The total occurrence rate of the pathogen and parasite of C. fastuosa is 48.2%. The gregarine pathogen and mermithid parasite infection rates are 48.1% and 7.7% respectively. In this study we report a gregarine pathogen and a mermithid parasite of C. fastuosa (Scopoli, 1763) (Coleoptera: Chrysomelidae) and their occurrence over a period of two years (2008 and 2009) from Turkey.