The stigma associated with LGB identities is what puts the group in a condition of social vulnerability. The minority stress theory advocates the idea that social minorities have contact with specific stressors in addition to everyday stressors, which do not depend on a position of social vulnerability. Individual and environmental factors may act as risk and / or protective factors in impairing the mental health of LGB individuals. The objectives of this thesis are: 1) to present the Minority Stress theory in LGB individuals through a review of the national and international literature; 2) to verify the impact of sexual orientation on the three minority stressors (experiences of victimization, internalized homophobia and concealment of sexual orientation); 3) to test the moderating role of social support and family support in the relationship between the variables sexual orientation, victimization experiences, internalized homophobia and concealment of sexual orientation, and 4) to verify the possible moderating effects of community connectivity on the relationship between internalized homophobia and negative mental health outcomes. No relationship was found between the variables mentioned above. It is understood that this may have happened due to sociodemographic characteristics of the sample, advances in public policies aimed at LGB individuals in Brazil in the last years and limitations of the studies, which were conducted virtually, which may have led to a response bias.