BACKGROUND: Current literature on surgical outcomes after gender affirming genital surgery is limited by small sample sizes from single-center studies. AIM: To use a community-based participatory research model to survey a large, heterogeneous cohort of transmasculine patients on phalloplasty and metoidioplasty outcomes. METHODS: A peer-informed survey of transmasculine peoples' experience was constructed and administered between January and April 2020. Data collected included demographics, genital surgery history, pre- and postoperative genital sensation and function, and genital self-image. OUTCOMES: Of the 1,212 patients completing the survey, 129 patients underwent genital reconstruction surgery. Seventy-nine patients (61 percent) underwent phalloplasty only, 32 patients (25 percent) underwent metoidioplasty only, and 18 patients (14 percent) underwent metoidioplasty followed by phalloplasty. RESULTS: Patients reported 281 complications requiring 142 revisions. The most common complications were urethrocutaneous fistula (n = 51, 40 percent), urethral stricture (n = 41, 32 percent), and worsened mental health (n = 25, 19 percent). The average erect neophallus after phalloplasty was 14.1 cm long vs 5.5 cm after metoidioplasty (P < .00001). Metoidioplasty patients report 4.8 out of 5 erogenous sensation, compared to 3.4 out of 5 for phalloplasty patients (P < .00001). Patients who underwent clitoris burial in addition to primary phalloplasty did not report change in erogenous sensation relative to primary phalloplasty patients without clitoris burial (P = .105). The average postoperative patient genital self-image score was 20.29 compared with 13.04 for preoperative patients (P < .00001) and 21.97 for a historical control of cisgender men (P = .0004). CLINICAL IMPLICATIONS: These results support anecdotal reports that complication rates following gender affirming genital reconstruction are higher than are commonly reported in the surgical literature. Patients undergoing clitoris burial in addition to primary phalloplasty did not report a change in erogenous sensation relative to those patients not undergoing clitoris burial. Postoperative patients report improved genital self-image relative to their preoperative counterparts, although self-image scores remain lower than cisgender males. STRENGTHS & LIMITATIONS: These results are unique in that they are sourced from a large, heterogeneous group of transgender patients spanning 3 continents and dozens of surgical centers. The design of this study, following a community-based participatory research model, emphasizes patient-reported outcomes with focus on results most important to patients. Limitations include the recall and selection bias inherent to online surveys, and the inability to verify clinical data reported through the web-based questionnaire. CONCLUSION: Complication rates, including urethral compromise and worsened mental health, remain high for gender affirming penile reconstruction. Robinson IS, Blasdel G, Cohen O, et al. Surgical Outcomes Following Gender Affirming Penile Reconstruction: Patient-Reported Outcomes From a Multi-Center, International Survey of 129 Transmasculine Patients. J Sex Med 2021;18:800-811.