The 21st century has seen dynamic social, legal, and political change regarding the rights and acceptance of lesbian, gay, bisexual, trans, intersex, and queer/questioning (LGBTIQ+) people. This article argues that social norm perceptions—perceptions of other people's opinions in a given social context—and the political dynamics that shape those perceptions are important for understanding differences in LGBTIQ+ acceptance across sociopolitical environments and time periods. Instead of emphasizing “actual” norms—people's opinions on average in different groups—we focus on norm perceptions since people often conform to the attitudes and behaviors held and endorsed by others to achieve social belonging and accuracy in their judgments. We review evidence regarding structural (e.g., laws and institutional decisions), group (e.g., social identities), and individual (e.g., ideology) factors that influence perceptions of, and conformity to, norms of LGBTIQ+ inclusion or exclusion. Drawing on this review, we consider how political dynamics—the ways that civic and political actors make salient, promote, and frame issues, values, and norms in contesting or maintaining the status quo—influence interpretations of, and responses to, norm signals, thus shaping differences in LGBTIQ+ rights norms across contexts and time periods. In conclusion, we chart future areas for research, policy, and practice.