Aims: To assess the perioperative and short-term functional and oncologic outcomes of the salvage robot-assisted radical prostatectomy (sRARP), after recurrence following primary proton beam therapy for clinically localized prostate cancer. Methods: Ten patients undergoing sRARP after failure of the prior definitive proton beam therapy for localized prostate cancer were included. BCR is defined as a prostate-specific antigen (PSA) value of 2.0 ng/mL greater than the absolute nadir. All of the individuals had a diagnosis of prostate cancer via biopsy after proton beam therapy, with negative findings on magnetic resonance imaging/computer tomography of the pelvis and abdomen, and a bone scan. The sRARP procedure with pelvic lymph node dissection was performed by a single surgeon in all patients. Results: The median age of the cohort at sRARP was 66.8 years, and the mean BMI was 29.2 kg/m 2 . The mean duration from proton beam therapy to sRARP was 58.4 months; the mean preoperative PSA level was 5.5 ng/mL, the mean operative time was 230 minutes, and the approximate blood loss was 745 mL. Anastomotic leakage occurred in half of the individuals, and bladder neck contracture developed in 6 patients. For 8 patients, the continence results within 6 months follow-up were available. Overall, 24 complications occurred in 9 patients. At follow-up in the 32nd month, the overall survival rate was 80%, and the BCR-free survival rate was 90%. Conclusion: sRARP after proton beam therapy is an applicable procedure, but has a high risk of serious complications.