Background: Hypopigmentary disorders are common group of dermatoses in pediatric age group. Some are transitory and require only one or few visits to the dermatologist, while others are chronic and recurrent. Thus require more follow-up. Aim: To determine the commonest causes of hypopigmented diseases and their prevalance among primary school children in Zagazig City. Methods: A pilot study was carried out on 40 patients of both sexes chosen by random sample. Aged from 6-11 years from one primary school children in zagazig city. The data were collected by An interview questionnaire, complete history was taken, Clinical examination. Results: The overall prevalence of hypopigmented diseases among the studied primary school children was 62.5%. The most prevalent hypopigmented diseases were pityriasis alba 56%, followed by pityriasis versicolor 24%, post-inflammatory hypopigmentaion 20%. Conclusions: Common hypopigmentary diseases constitute a significant health problem among primary school children in Zagazig city. The most prevalent hypopigmented diseases were pityriasis alba 56%, followed by pityriasis versicolor 24%, post-inflammatory hypopigmentaion 20%.