This is a clinical practice guideline for patients with epithelial ovarian cancer including fallopian tube cancer and primary peritoneal cancer. Less common histopathologies including ovarian low malignant potential (LMP) tumor, malignant germ cell neoplasms, carcinosarcomas (malignant mixed Müllerian tumors [MMMTs] of the ovary), and malignant sex cord-stromal tumors, are also discussed. The guideline provides recommendations on diagnosis, treatment, follow-up, and relapse. Primary treatment options for ovarian cancer include surgery (risk-reducing or cytoreductive), chemotherapy (neoadjuvant and adjuvant), incomplete surgery and/or staging, anti-angiogenesis agents, and radiation therapy. The number of chemotherapy cycles and agents are reviewed, along with drug reactions.