Received at: 18/10/2012   Accepted:   /  /  This study included diagnosis of some parasitic worms and intestinal protozoa which infected the cattle, through the examination of (325) fecal samples which where collected randomly from the different regions in Mosul city, from the animals in different ages, from October (2011) to March (2012). The total percentage of infection with different species of parasites was (53.53%). The percentages have been influenced through the months of the study. The high percentage of infection appeared in January was (76.66%) and low percentage appeared in February was (23.68%). The high percentage of infection in intestinal protozoa was (60.91%), while the percentage of infection in Nematoda was (49.42%) then the percentage in Trematoda and Cestoda were (17.24%), (1.72%) respectively. In this study has been diagnosed (12) Genera in Nematoda. The infection of Capillaria bovis was the first record in Mosul city, also in this study has been described the adult worm of Toxocara vitulorum which found in the feces of infected calves, that is not mentioned previously in Mosul city. Also has been diagnosed (5) species in Trematoda, the high percentage of infection is Dicrocoelium dendriticum was (8.04%), while by Cestoda the percentage was (1.72%) in one species Moniezia expansa. The results indicated the (5) species by intestinal protozoa which are infected the cattle, the high percentage of infection in Cryptosporidium spp. was (35.05%). The severity of infection with Nematoda was high percentage of inflection in low grade, then severe and moderate grade. __________________________________________________________________________________________