The hematozoa occurring in 217 of 922 Ugandan birds of 107 species is reported. Species of Haemoproteus were the most prevalent blood parasite, occurring in 82^% of the infected birds. The other groups of avian hematozoa encountered, namely Leucocytozoon (6%), Plasmodium (5%), Trypanosoma (7%) and microfilaria (6%), were virtually identical in their rate of occurrence in the bird population. Multiple infections (6.9%) were uncommon. The highest prevalence of blood parasites were recorded in the Zosteropidae (80%) and Ploceidae (56%). Birds showed blood parasitaemias throughout the year, but the peak prevalence was in October, suggesting that vectors were most active at this time.