Intestinal cryptosporidiosis was diagnosed in two children. Both had severe diarrhoea with vomiting and low-grade fever. Examination of the stool by the safranin-methylene blue stain showed oocysts of Cryptosporidium sp. Both patients were immuno-competent, the disease was self-limiting, and they recovered on supportive therapy only. The source of infection was not established. Cryptosporidiosis should be included in the differential diagnosis of acute diarrhoea among children, and a stool examination should be requested specifically for this parasite. These two patients in Kuwait are the first to be reported in the Arabian Gulf.