During a survey in Kermanshah province, western Iran, seven species of mites of the genus Tydeus (Acari: Prostigmata: Tydeidae) were collected from 2006 to 2013. Tydeus helenipanoue Ka´zmierski, 1998 is recorded for the first time in Iran. Tydeus californicus (Banks, 1904), T. electus Kuznetzov 1973, T. inclutus Livshitz, 1973, T. kochi Oudemans, 1928 and T. mississippiensis Baker 1970 are new for the fauna of this province. Previously invalidated T. caudatus is herein revalidated. Several new hosts for these species have been recorded, diagnoses for T. caudatus and T. helenipanoue proposed, and an identification key is provided for all these species. A list of previously recorded mites of genus Tydeus from Iran until 2015 is also added.
