Purpose Endometrial cancer (EC) is the most common gynecological cancer among women in the United States. Despite well-documented racial/ethnic disparities in EC incidence and mortality rates, limited data exist regarding disparities in hysterectomy surgical outcomes. We evaluated associations of race/ethnicity with postoperative complications, serious adverse events (SAEs), and length of hospital stay among women undergoing EC-related hysterectomy. Methods Using National Surgical Quality Improvement Program (NSQIP) data, we identified women (≥18 years) undergoing hysterectomy to treat EC between 2014 and 2020. We used multivariable logistic regression to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for associations of race/ethnicity (white, black, and Latina) with postoperative complications and SAEs. We used Poisson regression with robust standard errors to calculate incidence rate ratios (IRRs) and 95% CIs for the association of race/ethnicity with length of hospital stay. Results Of 22,778 women undergoing EC-related hysterectomy, 3.1% developed postoperative complications. Black (adjusted OR: 1.62; 95% CI 1.05–2.48) and Latina women (adjusted OR: 1.79; 95% CI 1.04–3.09) had higher postoperative complication risks than white women. The overall SAE incidence was 5.0%. Black women (adjusted OR: 1.55, 95% CI 1.13–2.15) had higher SAE risks than white women. Length of hospital stay was significantly longer for black women than white women (IRR: 1.18; 95% CI 1.07–1.30). Conclusions We observed racial/ethnic disparities in EC-related hysterectomy surgical outcomes in a large, diverse sample of U.S. women between 2014 and 2020. Studies to elucidate the underlying mechanisms of these racial disparities, with a focus on social context remain necessary.