This set is aimed at students and educators interested in an interdisciplinary perspective on LGBTQ issues. It examines and provides understandings of the lives and experiences of LGBTQ individuals, with attention to the contexts and forces that shape their world. It addresses questions such as: What are the key theories used to understand variations in sexual orientation and gender identity? What does LGBTQ+ affirmative therapy look like? How have anti-LGBTQ ballot measures affected LGBTQ people? What are LGBTQ+ people's experiences during COVID-19? How were LGBTQ+ people impacted by the Trump administration? What is life like for LGBTQ+ people living outside the United States? This encyclopedia looks at LGBTQ issues and identity primarily through the lenses of psychology, human development, and sociology, while emphasizing queer, feminist, and ecological perspectives on this topic. Entries are written by top researchers and clinicians across multiple fields-psychology, human development, gender/queer studies, sexuality studies, social work, nursing, cultural studies, education, family studies, medicine, public health, and sociology.