Chigger mites of northern Iran were studied on the basis of field collections from rodent hosts. Thirty-five species were recorded. Two new species, Cheladonta afshari Stekolnikov and Shamsi sp. nov., collected on Apodemus sp. in Guilan and Mazandaran Provinces, and Neotrombicula tehranensis Stekolnikov and Shamsi sp. nov., collected on Cricetulus migratorius and Chionomys sp. in Tehran Province, are described. One new synonym is established: Neotrombicula vernalis (Willmann, 1942) (= Neotrombicula kermani Kudryashova, 1977 syn. nov.). Seventeen species were recorded in Iran for the first time; thus, the number of known Iranian chiggers constitutes 104. The record of Neotrombicula autumnalis (Shaw, 1790) in Iran is important from the veterinarian and medical points of view, as this species attacks humans and domestic animals.
Keywords: Acari, chiggers, Western Asia, distribution, taxonomy.