A new species of Gaeolaelaps (Acari, Mesostigmata, Laelapidae) is described based on morphological characters of adult females collected from nest of Formica sp. (Hymenoptera: Formicidae) in the Shahrekord Region, Chaharmahal va Bakhtiari province, Iran. A key for the identification of species of Gaeolaelaps with short peritremes is presented.