Background: The 5-year survival rates for adolescents and young adults (AYA) with cancer have steadily improved, yet disparities by race/ethnicity persist. The drivers of these disparities remain unclear. Neighborhood socioeconomic deprivation has been linked to adverse health outcomes independent of the effects of individual-level measures of social determinants of health (SDOH). We evaluated the impact of neighborhood SDOH on overall survival (OS) in a diverse AYA cancer patient population treated in a single academic setting. Methods: This study utilized a multi-ethnic cohort of AYA cancer survivors (N=10,261) diagnosed between ages 15-39 seen at MD Anderson Cancer Center between 2000 and 2016. Patient demographics, zip code at presentation, cancer characteristics, and follow-up were obtained from our institutional tumor registry. Zip codes were linked to Area Deprivation Index (ADI) values, a validated neighborhood-level SDOH measure, with higher ADI representing worse SDOH. Results: The cohort included 6,361 (62%) non-Hispanic White, 1,112 (10.8%) non-Hispanic Black, and 2,133 (20.8%) Hispanic AYA cancer patients, with 655 (6.4%) of other ethnicities or missing information. The mean ADI value was significantly higher (p<0.05) for Black (61.7) and Hispanic (65.3) patients, compared to White (51.2) patients. Analysis of ADI by cancer type showed significant differences, mainly driven by the significantly higher ADI in patients with cervical cancer (62.3) than other cancer types. In contrast, AYA patients diagnosed with breast cancer (53.0) and CNS tumors (52.9) resided in neighborhoods with the lowest ADI values. ADI was a significant predictor of OS overall. In multivariable models that included gender, age at diagnosis, cancer diagnosis, and race/ethnicity, risk of death for AYA cancer patients residing in neighborhoods with ADI in the highest quartile was greater than that for patients in the lowest quartile (HR: 1.09, 95% CI: 1.00-1.19, p=0.043). Conclusions: Our results in this large multi-ethnic cohort indicate that non-White AYA patients with cancer more commonly live in neighborhoods associated with higher ADI compared to their White counterparts. Even when treated in the same academic setting, AYA cancer patients with higher ADI experienced worse OS across cancers. Although the magnitude of the effect was moderate, the presence of this effect within a tertiary cancer center with existing barriers to care suggests that ADI is a meaningful risk factor impacting survival. Further analysis is warranted to determine the generalizability of these findings to the patient population more broadly. However, the results provide intriguing evidence for potential interventions aimed at supporting AYA cancer patients from disadvantaged backgrounds.