The peach fruit fly Bactrocera zonata (Saundera) (Diptera: Tr2phritidae) is detected for the first time in Giza governorate on potatoes during October 2004. Most of insect pests attack potato; So/anum tuberosum L. (Solanaceae) are injured in all regions by aphids, tuber moth, wite flies and mites (Fetoh, 2003). The peach fruit fly, Bactrocera zonata is an important insect attacks many fruit species (more than 50 host plants) including guavas, mangoes, peach, apricots, figs and citrus. The larvae feed on the pulp of ripe fruits inflecting a serious damage, makes fruits unfavorable for marketing and exportation; (Bezzi, 1915, White et at, 1994 and Alto et al. 1996). In the present work potato tubers were collected from Giza governorate during October 2004 and transferred directly to the laboratory. They were examined in a first instance (externally for the presence of fruit fly ovipurctures and internally for larvae) and then placed on a sand medium in suitable containers until pupation and adult emergence (to facilitate accurate identification). Insects were then Killed by freezing and identified by Insect Classification and Surveying Research Department (PPRI) es Bactrocera zonata (Saundera)(Diptera:Tephritidae) and this considered the first record of this species on potatoes in Egypt.