The aim of this study was to investigate the infection rates as well as the types of Gastrointestinal worms in local sheep admitted to the veterinary teaching hospital at the University of Mosul from the beginning of March 2021 until the end of August 2021, the study also included the effect of Gastrointestinal worms on blood picture in affected animals, 120 faeces and blood samples were collected from native sheep, 12 sheep were clinically normal and negative for gastrointestinal tract parasites and served as control, the results of laboratory examination of faeces samples showed 80 (120) samples were positive for Gastrointestinal worms with a total of infection rate 66.66%, Infection with eggs of Marshallagia spp represented the highest rate of infection amounting to 50 %, followed by infection with eggs of Ostertagia spp at a rate of 17.5 %, while the percentage of infection with eggs of Haemonchus spp. was 15%, Oesophagostomum spp. Nematodirus.spp, Trichostrongylus Spp had the lowest infection rates( 7.5,5.5) % respectively. Blood pictures of infected animals showed a significant decrease (P
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