Federal and state law in the United States prohibit sex discrimination in employment, education, housing, places of public accommodation, credit, and other settings. Sex discrimination is discrimination motivated by a person’s sex or gender. The current entry discusses that courts and governmental entities charged with enforcing anti-discrimination laws in the United States are increasingly concluding that prohibitions on sex discrimination protect against sexual orientation discrimination. Before describing this trend, the current entry discusses some background concepts; the prevalence of discrimination against lesbian, gay, and bisexual (LGB) people; and the status of laws explicitly prohibiting sexual orientation discrimination.