Lesbian, gay, and bisexual (LGB) individuals are less healthy than heterosexual individuals, and minority stress endured by LGB individuals contributes to these health disparities. However, within-groups differences in minority stress experiences among LGB individuals remain underexplored. Individuals are more likely to be categorized as LGB if they exhibit gender nonconformity, so gender nonconformity could influence concealability of sexual orientation among LGB individuals, carrying important implications for the visibility of their stigmatized sexual orientation identity and for how they experience and cope with minority stress. Through a meta-analytic review, we examined how gender nonconformity was associated with minority stress experiences among LGB individuals. Thirty-seven eligible studies were identified and included in analyses. Results indicate gender nonconformity is associated with experiencing more prejudice events, less concealment of sexual orientation, lower internalized homonegativity, and higher expectations of rejection related to sexual orientation among LGB individuals. Gender nonconformity is more strongly associated with experiencing prejudice events among gay and bisexual men than among lesbian and bisexual women. Gender nonconformity is systematically associated with minority stress experiences among LGB individuals, and future research must measure and examine gender nonconformity when investigating the role of minority stress in degraded health outcomes among LGB populations.