BACKGROUND: Food insecurity predisposes individuals to suboptimal nutrition, leading to chronic disease and poor outcomes. OBJECTIVE: We sought to assess the impact of county-level food insecurity on colorectal surgical outcomes. DESIGN: Retrospective cohort study. SETTING: Data from the Surveillance, Epidemiology, and End ResultsMedicare database was merged with county-level food insecurity obtained from the Feeding America: Mapping the Meal Gap report. Multiple logistic and Cox regression adjusted for patient-level covariates were implemented to assess outcomes. PATIENTS: Medicare beneficiaries diagnosed with colorectal cancer between 2010 and 2015. MAIN OUTCOME MEASURES: Surgical admission type (nonelective and elective admission), any complication, extended length of stay, discharge disposition (discharged to home and nonhome discharge), 90-day readmission, 90-day mortality, and textbook outcome. Textbook outcome was defined as no extended length of stay, postoperative complications, 90-day readmission, and 90-day mortality. RESULTS: Among 72,354 patients with colorectal cancer, 46,296 underwent resection. Within the surgical cohort, 9091 (19.3%) were in low, 27,716 (59.9%) were in moderate, and 9,489 (20.5%) were in high food insecurity counties. High food insecurity patients had greater odds of nonelective surgery (OR: 1.17; 95% CI, 1.091.26; p < 0.001), 90-day readmission (OR: 1.11; 95% CI, 1.041.19; p = 0.002), extended length of stay (OR: 1.32; 95% CI, 1.211.44; p < 0.001), and complications (OR: 1.11; 95% CI, 1.031.19; p = 0.002). High food insecurity patients also had decreased odds of home discharge (OR: 0.85; 95% CI, 0.790.91; p < 0.001) and textbook outcomes (OR: 0.81; 95% CI, 0.750.87; p < 0.001). High food insecurity minority patients had increased odds of complications (OR 1.59; 95% CI, 1.431.78) and extended length of stay (OR 1.89; 95% CI, 1.692.12) compared with low food insecurity white patients (all, p < 0.001). Notably, high food insecurity minority patients had 31% lower odds of textbook outcomes (OR: 0.69; 95% CI, 0.620.76; p < 0.001) compared with low food insecurity White patients (p < 0.001). LIMITATIONS: This study was limited to Medicare beneficiaries aged 65 years or older; hence, it may not be generalizable to younger populations or those without insurance or with private insurance. CONCLUSIONS: County-level food insecurity was associated with suboptimal outcomes, demonstrating the importance of interventions to mitigate these inequities. See Video Abstract.