Eosinophilic peritonitis is a response of the peritoneum to foreign substances. It presents as cloudy dialysate and may be missed because not all laboratories report the eosinophil count, giving only the total number of polymorphonuclear cells. Over a 2-year period, eight children developed 13 episodes of eosinophilic peritonitis. Three episodes were asymptomatic other than cloudy fluid, five followed surgery and two were associated with gastroenteritis. Despite recurrent episodes, there were no adverse outcomes, although a raised peritoneal eosinophil count persisted in most cases. Eosinophilic peritonitis is under-diagnosed and may lead to unnecessary antibiotic therapy.