Sexual assault is unfortunately common, especially among lesbian, gay, and bisexual (LGB) individuals. Yet, the associations of such victimization have not yet been extensively established in the areas of sexual identity and romantic relationship functioning. Accordingly, the present study examined the associations between lifetime sexual assault, LGB identity, and romantic relationship functioning in a sample of 336 LGB individuals. A history of sexual assault was associated with attachment anxiety and several sexual identity components (i.e., higher levels of acceptance concerns, identity uncertainty, internalized homonegativity, and identity superiority). Furthermore, an association of sexual assault and attachment avoidance was moderated by internalized homonegativity. Finally, a more secure LGB identity was associated with healthier romantic relationship functioning. Collectively, these findings are applicable to services for LGB sexual assault victims, suggesting the incorporation of treatment that bolsters LGB identity and couple functioning. Limitations and future directions are discussed.