The current study included diagnosing types of ectoparasites on five types of fish of Tigris River passing through Al-Dour district/Iraq, and the study was conducted at College of Education/University of Samarra and Tikrit Universit/College of Education for women/Department of Biology. A total of 772 fish included five species, and it was found that they were infected with 6 types of parasites with different rates of infection, which included two types of protozoa: Trichodina mutabilis and recorded in four types of hosts for the first time in Iraq with a rate of 9.0% in Leuciscus vorax and Barbus luteust fish, and a rate of 6.7% In Tenualosa ilisha fish, and the percentage of 6.0% in the fish of Cyprinion macrostomum, and the sporozoa Myxobolidae sharpeyi was recorded in four new hosts locally in Iraq from Cyprinion carpio, Tenualosa ilisha, Leuciscus vorax and C. macrostomum, and the infection rates were 10.0%, 6.1%, 9.0%, and 6.8%, respectively.. And two types of trematodes: Dactylogyrus vastator, with an infestation rate of 11.9% in B. luteust and 9.0% in C. carpio, and G. gussevi. Five new hosts were recorded locally in Iraq of C. carpio, B. luteust, L. vorax, T. ilisha, and C. macrostomum, with a rate of 12.0%, 9.6%. 8.1%, 6.7%, and 5.1%, respectively. And two types of Crustaceans, namely, Pseudulamproglena annulata, the infection rate was recorded only in C. carpio 12.0%, and Lamproglena pulchella, where the infection rate was 12.0% in B. luteust and 5.0% in C. carpio.