Retroperitoneal sarcomas (RPS) represent approximately 15% of all soft tissue sarcomas (STS). Clinical and prognostic features as well as oncologic outcomes are well known in this group of patients. Post-operative margin status specifically, is a major predictor of local and distant recurrence and survival. The purpose of this review is to define complete resection as it applies to RPS and evaluate its effect on future outcomes in these patients. J. Surg. Oncol. 2008;98:607-610. © 2008 Wiley-Liss, Inc.