Аннотация:Avian haemosporidian parasites (Haemosporida) are widespread among passerine birds. While long consideredbenign, detailed studies revealed severe consequences, including tissue/organ damage and mortality. Climate changeexacerbates the spread of blood-sucking vectors of haemosporidian parasites from southern tropical regions into newnorthern regions. In our study, we focused on the diversity of three most prevalent haemosporidian parasite genera infectingbirds in the White Sea region: Plasmodium, Haemoproteus, and Leucocytozoon. We found haemosporidianparasites in 60% of sampled passerine birds, with prevalent co-infections, necessitating further genetic analysis. Despitechallenges and a small sample size, we identified unique parasite lineages underscoring the need for ongoing research.Additionally, we identified seven malaria genetic lineages in 11 birds from five species, with three lineages likelyoriginating from tropical Africa. Our findings highlight the importance of monitoring haemosporidian parasites spreadin northern avian populations, especially amid changing environmental conditions