PurposeSexual and gender minority (SGM) young adults are disproportionately impacted by homelessness and heavy drinking (i.e., having five or more drinks of alcohol in a row within a couple of hours). Social support, in general, is protective in reducing individuals’ risk of heavy drinking. However, whether and how support from different sources may have different implications on heavy drinking among SGM young adults experiencing homelessness (SGM-YAEH) remains unclear. Informed by the risk amplification and abatement model (RAAM), this study examined the associations between support sources and heavy drinking among SGM-YAEH. MethodsA purposive sample of SGM-YAEH (N=425) recruited in homeless service agencies from seven major cities in the U.S. completed a self-administered computer-assisted anonymous survey. This survey covered heavy drinking behaviors and social network properties. Logistic regression models were conducted to identify social support sources associated with SGM-YAEH’s heavy drinking. ResultsOver 40 % of SGM-YAEH were involved in heavy drinking in the past 30 days. Receiving support from street-based peers (OR=1.9; 95 % CI=1.1, 3.2) and home-based peers (OR=1.7; 95 % CI=1.0, 2.8) were each positively associated with SGMYAEH heavy drinking risks. ConclusionThis study was not able to identify the protective role social supports may play in reducing SGM-YAEH’s heavy drinking. Furthermore, receiving support from network members was correlated with elevated heavy drinking risks among this population. As heavy drinking prevention programs develop interventions: they should use affirming and trauma approaches to promote protective social ties, as research points to its association in reducing alcohol use disparities among SGM-YAEH.