Two new species and an additional record of eriophyid mites from semi-arid and arid environments in East Iran are reported. Aculops ammodendris sp. nov. from Ammodendron persicum Bunge ex Boiss. (Leguminosae) and Aceria launaeae sp. nov. from Launaea acanthodes (Boiss.) Kuntze (Asteraceae) are described and illustrated. No symptoms were observed on the infested host plants. These two new species are the first eriophyid mites on plant species within the genera Ammodendron and Launaea. Geographical distribution of Aceria angustifoliaeDenizhan, Monfreda, de Lillo & Çobanoglu, 2008, extended also into the currently studied Iranian area in addition to a previous record from Turkey and Northern Khorasan.