Due to the increase in tick-borne diseases globally, this investigation was proposed to investigate the distribution and intensity of the species belonging to Hyalomma C. L. Koch, 1844 that have been infesting livestock in Diyala Province, central of Iraq. The total percentage of infestation was 14.955% distributed as 19.600% for cow, 12.254% for sheep, and 29.411% for goat. The infestation varies among the districts of Diyala Province, and the highest infestation was in females compared with males, and it was distributed in different sites of animal bodies. The study concludes that the genus Hyalomma is widespread in all districts of the province and that there are six species belonging to this genus, including: Hyalomma anatolicum Koch, 1844, H. exacavatum Koch, 1844, H. impeltatum Schulze & Schlottke, 1930, H. marginatum C. L. Koch, 1844, H. rufipes C. L. Koch,1844, and H. scupense Schulze, 1919.