Kallmann syndrome is a rare combination of hypogonadotropic hypogonadism due to hypothalamic insufficiency and anosmia. In both patients treated at our institution for infertility, a malformation of the uterus was noted: one patient had a unicornuate uterus, the other a uterus with a fundal hypoplasia and tubes of approximately 9 cm. It is not clear if the malformation is in association with Kallmann syndrome or purely coincidental. Given the known association of other malformations with Kallmann syndrome, we suppose that probably an underlying genetic defect having to do with organogenesis is the cause of the uterine malformations.