Turner's syndrome is a sex chromosome disorder. Klinefelter's syndrome is one of the most severe genetic diseases. Neurofibromatosis is an autosomal dominant disorder characterized by cafe-au-lait spots and fibromatous tumors of the skin. In this article, we report the overlap of neurofibromatosis-1 with Turner and Klinefelter syndromes. Thus, these disorders might overlap within the same patient. Due to these cases, we suggest that each patient with Turner-like symptoms or Klinefelter's-like syndrome, be carefully examined for cafe au lait macules before the initiation of hormone replacement treatment.