Many questions have been raised recently about the possible association between ovulation induction and ovarian cancer. In order to contribute to the limited literature on this important issue, two cases of ovarian cancer in women who had multiple ovulation induction are presented here. In the first case the patient had ovarian induction by clomiphene citrate while she already had an ovarian cyst. The cyst enlarged under induction. During laparoscopy, the cyst was removed. Histological examination showed a borderline and invasive sero-papillary cystadenoma. In the second case, the patient underwent ovulation induction and intrauterine insemination. During the first ultrasound in the beginning of the cycle, an ovarian cyst was discovered. Laparoscopy was performed and the cyst removed. Histological examination showed a borderline and invasive mucinous cystadenoma.