During the study on eriophyid mites associated to Fabaceae plants in Naghare village, Lorestan province (Iran), one new Aculus species (Acari: Eriophyidae), A.lorestaniensissp. nov., was found on Glycyrrhizaglabra L. and herein described and illustrated. This is the first Aculus mites associated to a host plant of the genus Glycyrrhiza.