ABSTRACT Introduction Anabolic-androgenic steroids (AAS), synthetic derivatives of the male sex hormone testosterone, are often used to enhance athletic performance and physical appearance. Long term use of AAS can be associated with mood destabilizing effects and psychotic behavior. We hypothesized that AAS use is an independent risk factor for mental health disorders. We investigated AAS use and associations with major depressive disorder (MDD), suicide attempt (SA)/intentional self-harm (ISH), and body dysmorphic disorder (BDD) by querying TriNetX, a global health research network that provides data on large cohort of patients from multiple centers across the United States. Objective To determine the association between AAS use with MDD, SA/ISH, and BDD. Methods To evaluate the psychiatric risk of AAS use two cohorts of adult men, aged 18-50, without history of gender dysphoria (F64, Z87.890) (1) history of documented AAS use, inclusive of testosterone prescriptions (2) history of a visit to a healthcare organization and no history of AAS use. We accounted for confounding variables known to be associated with a risk of mood disorders through propensity score matching by logistic regression for age, race, ethnicity, male hypogonadism (E29.1), history of nicotine dependence (Z87.891), or alcohol-related disorder (F10). We evaluated the association between steroid use and subsequent diagnosis of MDD (F32-33), SA/ISH (T14.91, X71-83, T36-65 and T71 ISH codes), or BDD (F45.22) as a primary outcome through regression analysis with statistical significance assessed at p<.05. Results We identified 159,717 cis-men between age 18-50 who used AAS and following propensity score matching for confounding variables, we compared them to an equal-sized cohort of men without AAS use. AAS use was independently associated with all of the psychiatric outcomes that we studied (MDD OR 2.96 95% CI 2.88-3.04 p<.0001, SA/ISH OR 1.37 95% CI 1.25-1.50 p<.0001, BDD OR 5.37 95% CI 2.82-10.21 p<.0001). Strengths of the study include a large sample size, propensity score matching to adjust for confounding variables, and high strength of association. Limitations include lack of information regarding indication for steroid prescription or details regarding severity, duration, withdrawal, or possible steroid abuse. Conclusions AAS use appears to be an independent risk factor for MDD, BDD, and/or SA/ISH. Future studies are necessary to elucidate whether a dose-response association exists, withdrawal from AAS plays a role, and if patient selection or preventative measures can mitigate the risk. Men with suicide attempt, BDD, or MDD should be investigated for a history of AAS use. Further, men receiving AAS should be counseled on the possible risk of developing MDD in the future. AAS use can lead to profound and complex psychiatric complications which should be discussed in patient counseling. Disclosure No