First records of fungi in the families Caligonellidae, Cryptognathidae, Stigmaeidae and Tectocepheidae mites (Arachnida: Acari) from Turkey. - Fifteen (15) species of fungi infecting 8 species of acari collected from Erzurum, Turkey have been isolated. The relations between fungi and mites are discussed. Most of fungi isolated from the mites are saprophytic and soilbom, only one fungus species, Bauveria bassiana, is entomopathogenic. Fungi of the families Caligonellidae, Cryptognathidae, Stigmaeidae and Tectocepheidae mites are recorded for the first time in Turkey. Most researches on fungi concern infections in the families Tetranychidae and Eriophyidae in the Prostigmata. But, knowledge on fungi of mites of these families is definite and such study on this subject has not been reported before from Turkey.