Hydatid disease is endemic in Mediterranean region. The liver and the lungs are the most commonly involved organs. Isolated inguinal hydatid disease is extremely rare and is usually secondary to the involvement of other organs. We describe here a case of an adult with a right inguinal swelling progressively increasing in size with occasional pain. The diagnosis of right inguinal hernia was made. Hydatid cyst was detected coincidently detected during surgical.