Composite pelvic resection is often necessary to achieve complete gross resection for ovarian cancer. Surgeons should be prepared to manage common complications including bleeding from the common, internal, or external iliac arteries, venous plexus bleeding, urinary tract injuries, bowel injuries, and anastomotic complications. Careful patient selection through the use of a triage algorithm has been shown to reduce the impact of severe complications and mortality. Adherence to general surgical principles, proper procedural technique, and use of visual aids including indocyanine green angiography, bladder distention, or proctoscopy can minimize the risk of specific complications. Intra-operative or early post-operative recognition is important to minimize morbidity from complications. This chapter describes the management of vascular, urinary tract, and gastrointestinal complications including abscess, enteric/anastomotic leaks, and diversion.