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Adverse childhood experiences (ACEs) may be an early life factor associated with adult weight stigma via biological (e.g., stress response), cognitive (e.g., self-criticism/deprecation), and/or emotional (e.g., shame) mechanisms. This pilot study investigated relationships between ACEs and internalized and experienced weight stigma in adult women with overweight/obesity and explored differential relationships between weight stigma and ACE subtypes (i.e., abuse, neglect, household dysfunction). Adult women (68% white, M age = 33 ± 10 years, M BMI = 33.7 ± 7.2 kg/m 2 ) completed measures of ACEs (ACE Questionnaire), internalized weight stigma (IWS; Weight Bias Internalization Scale-Modified; WBIS-M), and lifetime experiences of weight stigma (yes/no). Data were analyzed with linear and logistic regression ( n = 46), adjusting for age, race, and body mass index (BMI). Linear regressions revealed a positive association between ACE and WBIS-M scores ( β = 0.40, p = 0.006), which was driven by Abuse-type ACEs ( β = 0.48, p = 0.009). Relationships between WBIS-M scores and Neglect- and Household-Dysfunction-type ACEs did not reach significance ( β = 0.20, p = 0.173; β = -0.16, p = 0.273). Though descriptive statistics revealed greater rates of experienced weight stigma endorsement by those with high-3+ ACEs (81%) vs. medium-1-2 ACEs (67%) or low/no-0 ACEs (60%), ACE scores were not significantly associated with experienced weight stigma in logistic regression (Wald = 1.36, p = 0.244, OR = 1.324, 95%, CI = 0.825-2.125). ACEs may be an early life factor that increase the risk for internalizing weight stigma in adulthood. Larger studies should confirm this relationship and follow-up on descriptive findings suggesting a potential association between ACEs and experienced weight stigma., Competing Interests: Conflicts of Interest: The authors declare no conflict of interest.