New occurrences of invasive mosquito species (Diptera: Culicidae) in Transdanubia, Hungary. Three invasive mosquito species (Aedes albopictus, Ae. j. japonicus, Ae. koreicus) were detected in the last years in Hungary. Our samplings were carried out between 2017 and 2019 to investigate the distribution of invasive mosquito species in Transdanubia. The results showed the presence of Ae. j. japonicus at 10 sampling locations of 5 settlements (1397 larvae and 10 adults) and the presence of Ae. koreicus at 4 locations of 2 settlements (259 larvae and 2 adults). The larvae of these species were detected only in technotelms and dendrotelms.