New records of water mites (Acari: Hydrachnidia, Halacaroidea) from interstitial waters of Iran are presented. Five species are recorded; Axonopsis caspica sp. nov. is described as new to science; new records from Iran are given of: Stygothrombium sp., Ljania macilenta Koenike, 1908, Kongsbergia pectinigera Motas & Tanasachi, 1946 and Lobohalacarus weberi (Romijn & K.Viets, 1924).