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Background: In this study, the authors compared conventional and robot-assisted mastectomy and breast reconstruction. To the authors' knowledge, this study is the first to report the results of robot-assisted mastectomy and breast reconstruction and provide a comparison of patient-reported outcomes., Method: This retrospective study included 473 breasts of 423 patients who underwent conventional mastectomy and breast reconstruction and 164 breasts of 153 patients who underwent robot-assisted mastectomy and breast reconstruction from July of 2019 to October of 2021. Demographic and oncologic data, reconstructive outcomes, and patient-reported outcomes (BREAST-Q) were evaluated. The results of implant-based and autologous breast reconstruction were evaluated separately., Results: Skin necrosis requiring surgical débridement occurred significantly more frequently in the conventional group (8.0%) than in the robot-assisted group (2.0%) in implant-based reconstruction ( P = 0.035). At 6 to 12 months, patients who underwent robot-assisted breast reconstruction showed a higher Sexual Well-being score for implant-based reconstruction and a higher Physical Well-being score for autologous breast reconstruction than conventional breast reconstruction according to the BREAST-Q questionnaire., Conclusions: Robot-assisted mastectomy and breast reconstruction was associated with less skin necrosis and better patient-reported outcomes (Sexual Well-being for implant-based reconstruction and Physical Well-being for autologous breast reconstruction) than the conventional option. Robotic surgery could be a good option for mastectomy and breast reconstruction., Clinical Question/level of Evidence: Therapeutic, III., (Copyright © 2023 by the American Society of Plastic Surgeons.)