Ovarian cancer is the leading cause of gynaecologic cancer death and the fourth most frequent cause of cancer death in women. 70% of all ovarian cancers will be diagnosed only at an advanced stage of the disease despite the improvements in diagnostic tools. Standard therapeutic concepts and new therapeutic modalities are discussed. Staging laparotomy with cytoreductive surgery is the most important part of initial patient management. Second-look operation has recently come under criticism, as it probably offers only minor therapeutic benefit. However, it remains the golden rule for evaluating different therapy modalities in the setting of a clinical trial. After surgery, chemotherapy is indicated for all patients with ovarian cancer FIGO stage III and IV. The question whether all patients with stage I and II disease need additional treatment remains unresolved. The standard regimen for patients with advanced ovarian cancer consists of six months' chemotherapy with a combination of cisplatin and an alkylating agent. Current cisplatin containing regimens achieve a clinical response rate of 60-80% and a documented pathologic complete response rate of 30% overall. Despite higher overall response rates and increased disease-free survival rates with cisplatinum combinations, long term survival is not significantly altered. Investigative approaches with intraperitoneal chemotherapy, biologic response modifiers and drug resistance modifiers may open new therapeutic avenues for this challenging disease. Radiotherapy (open field technique) also represents a highly active and curative treatment modality for certain ovarian cancer patients. Nowadays radiotherapy is mainly used as adjuvant treatment for patients with low risk early stage disease and as consolidation treatment for patients with complete remission after chemotherapy and second-look operation.