This article describes a social psychological framework for understanding sexual stigma, and it reports data on sexual minority individuals' stigma-related experiences. The framework distinguishes between stigma's manifestations in society's institutions ("heterosexism") and among individuals. The latter include "enacted sexual stigma" (overt negative actions against sexual minorities, such as hate crimes), "felt sexual stigma" (expectations about the circumstances in which sexual stigma will be enacted), and "internalized sexual stigma" (personal acceptance of sexual stigma as part of one's value system and self-concept). Drawing from previous research on internalized sexual stigma among heterosexuals (i.e., "sexual prejudice"), the article considers possible parallels in how sexual minorities experience internalized sexual stigma (i.e., "self-stigma", or negative attitudes toward the self). Data are presented from a community sample of lesbian, gay, and bisexual adults (N = 2,259) to illustrate the model's utility for generating and testing hypotheses concerning self-stigma. (Contains 8 tables and 6 footnotes.)