Iodine is a microelement necessary for thyroid gland hormones production. It is essential for the growth and development of human body. The aim of the study was to determine urine iodine excretion in schoolchildren living in urban area. We found out that approximately 42% of the examined children excreted small amounts of iodine with urine, which proves low dietary intake of the element. Therefore, it is necessary to promote the right dietary patterns and iodine supplementation in developing children.