The practice of partial mastectomy (PM) in patients with breast cancer has gained momentum over total mastectomy since the results of randomized clinical trials that have provided evidence demonstrating equivalent survival. 1 But in recent years there has been a relative decline in PM compared to bilateral mastectomies, which has been attributed to inadequate esthetic outcomes after PM without reconstruction, which ultimately affects patient satisfaction and their health-related quality of life. 2 On the other hand, PM with immediate reconstruction -what we define as oncoplastic breast surgery (OPBS) -has been proven to be a safe and efficacious means of improving both aesthetics outcomes compared to PM alone without affecting oncological outcomes. 3 Despite the benefits of OPBS, its nationwide utilization has never been precisely quantified. To facilitate future efforts to increase its availability to appropriate candidate patients, this study aims to establish the recent rate and temporal trends of national utilization of OPBS.The American College of Surgeons (ACS) National Surgical Quality Improvement Program (NSQIP) database was reviewed for the period 2006-2015 to identify all women 18 years and older who were diagnosed with invasive breast cancer or carcinoma in situ, and underwent PM, as well as identify the subset of women who also underwent any reconstructive procedure during the 30-day postoperative period.The primary outcome was the overall rate of OPBS for the study period, and the temporal trends from 2006 to 2015. The secondary outcome was the annual trend for each OPBS technique: volume displacement (VD), breast reduction (BR), volume reduction (VR), prosthesis, and mastopexy. All statistical tests were two-sided, and p-value of < 0.05 was considered significant. A total 91,129 women underwent PM during the period 2006-2015 of which 4.2% ( n = 3777

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