Transgender studies, broadly defined, has recently become more prominent as a field of study. The experiences and rights of trans people have increasingly become the subject of news coverage, such as their ability to access restrooms, participation in the military, driver's licenses that allow a third gender option, the growing visibility of nonbinary trans teens, the denial of gender-affirming health care to trans youth, and the media's misgendering of trans actors. With more trans people being open about their gender identities, doctors, nurses, psychologists, social workers, counselors, educators, higher education administrators, student affairs personnel, and others are increasingly working with trans individuals who are out. But many professionals have little formal training or awareness of trans people's life experiences and needs. This can seriously interfere with open communications with service providers, and can negatively impact health outcomes, well-being, and educational and career success and advancement. Having an authoritative, academic resource can go a long way toward correcting misconceptions and providing information that is otherwise not readily available. This encyclopedia takes an interdisciplinary and intersectional approach to trans studies. Topics include broad concepts (e.g., the criminal justice system, activism, mental health), specific subjects (e.g., the trans pride flag, the Informed Consent Model, voice therapy), and key historical figures, events, and organizations (e.g., Lili Elbe, the Stonewall Riots, Black Lives Matter). Entries focus on diverse lives, identities, and contexts, including experiences of trans people in different racial, religious, and sexual communities in the U.S. and the variety of ways gender is expressed in other countries. Covers psychology, sociology, history, family studies, K-12 and higher education, law/political science, medicine, economics, literature, popular culture, the media, and sports.