Allochaetophora urmiana sp. nov., a new species of the family Allochaetophoridae, is described and illustrated based on all instar stages (female, male, larva, protonymph and deutonymph). This is the second report of the family Allochaetophoridae for Iran and Asia, fourth for the world and first description of the protonymph stage. All specimens were collected from grassland in northwestern Iran. We also provide a key (based on the adult female and deutonymph) and a table of diagnostic characters for identification of all known species.