During the study on eriophyoid mite fauna (Acari: Eriophyoidea) of Phlomis plants (Lamiaceae) in northwest Iran, two species were collected: Aceria wisniewskii Lotfollahi et Houshyari sp. nov. on Phlomis sp. in Naghadeh county of West Azerbaijan province and Aceria onychia (Nalepa, 1915) on Phlomis herba-venti L. in Meshginshahr county of Ardabil province.