INTRODUCTION. Ovarian cancer is the sixth (6.) most common type of cancer in the Republic of Croatia, where 432 women suffered from this disease (18/100,000) in 2004. In the same year 280 women died from the disease (12,2/100,000). OBJECTIVES. To determine the existence of risk factors for the development of ovarian cancer in patients treated at the Clinic of gynecology and obstetrics, Clinical hospital center Osijek. STUDY DESIGN. Retrospective study. PARTICIPANTS AND METHODS. The subjects were patients at the Clinic of Gynecology and obstetrics, Clinical hospital center Osijek, who were treated in the period from 2010 to 2014 with the primary ovarian cancer diagnose. Data was collected from their medical history. The study included 60 women. RESULTS. For women above 65 years of age, the incidence of ovarian cancer is in 40 % of patients. In 47 % patients body weight was between 61 and 71 kilograms. 78 % patients had their first period aged 13 or 14. 60 % of them reached menopause when they were between 41 and 51 years old, and 87 % of them are in postmenopause. The generative age lasted between 27 and 37 years in 60 % patients and the same number, 60 %, had two children. The family medical history of 43 % patients was positive for ovarian cancer, breast cancer or colon cancer and 53 % of them had previous gynecological surgeries. Oral contraceptives were used by 10% of the patients. 87 % patients had comorbidity with diabetes mellitus or hypertension. CONCLUSION. There are some risk factors for ovarian cancer, which make up a group of women who are at a greater risk for getting the disease. Those are women above 65, who are in postmenopause, whose generative age lasted between 27 and 37 years, those whose family medical history was positive for ovarian cancer, breast cancer or colon cancer, women who’ve had previous gynecological surgeries and who also suffer from hypertension or diabetes mellitus. KEY WORDS. FIGO; ovarian cancer; risk factors.