Atresia coli is a congenital defect that result in an inability to pass feces since birth. In the present study, type IIIa atresia coli (blind ends) was identified in a male Arabian foal with clinical signs of abdominal distension, colic, failure in defecation and depression. At necropsy, segmental agenesis affected left ventral and right dorsal colon. The dorsal right colons, transverse, small colon and rectum were atrophic with narrow lumen. The prognosis was poor in this case. Atresia coli was reported in the various breed of foals but it seems this is the first report in an Arabian breed foal.