A survey was carried out to investigate the frequency of hard tick species (Acari: Ixodidae) on sheep in Khorasan Razvi province. A total of 812 ticks were collected from the sheep of different areas of Khorsan Razavi province five species were identified as follow: Rhipicephalus turanicus (59.23%), Hyalomma.marginatum turanicum (25.73%), Hyalomma excavatum (14.8%), Hyalomma anatolicum (8.3%), and Dermacentor niveus (4.8%). The frequency of tick infestation in southern parts was greater than northern parts of the province. R. turanicuss and H. m. turanicum. Were dominant ticks in the province.
