A new oribatid mite species, Oribatella umaetluisorum sp. nov. (Oribatellidae), is described from Cat Tien National Park (southern Vietnam). It was collected in the dark loamy soil of Lagerstroemia forest. Oribatella umaetluisorum sp. nov. has bidentate rostrum, clavate sensilli, microfoveolate body surface, striate epimeral region, serrate anterior margins of pteromorphs and length of notogastral setae, similar only to Oribatella sculpturata from Vietnam, but these species clearly differ by the body size, integumental ornament, shape of basal part of lamellae and distal part of tutoria and the number of leg claws. An identification key to species of Oribatella of the Oriental region is presented. [ABSTRACT FROM PUBLISHER]