SUMMARY
An account on important protozoan diseases mostiy with obvious clinical symptoms are emphasized and their current status reviewed. Those diseases are surra, trichomonosis in catde, babesiosis, anaplasmosis, theileriosis, leucocyto-zoonosis in chicken, and coccidiosis. Toxoplasmosis, histomonosis, chicken malaria, balantidiosis and diseases caused by Giardia, Haemoproteus and Sarcocystis are not reviewed because significant problems caused by these parasites considered important economically do not appear in Indonesia.